Category: pyridine-derivatives

Di Stefano, Vincenzo published the artcileTumour-like presentation of atypical posterior reversible encephalopathy syndrome with prominent brainstem involvement., Recommanded Product: Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, the main research area is Brain stem/cerebellum; neuro-oncology; neuroimaging; neurology; radiology.

Typical posterior reversible encephalopathy syndrome (PRES) is a clinical-neuroradiological entity characterised by bilateral white matter oedema, which is usually symmetrical and totally reversible in 2-3 weeks. A 46-year-old man presented with a persistent headache and visual blurring in the right eye. On admission, the clinical examination revealed minimal unsteadiness of gait and elevated blood pressure. A brain MRI showed a hyperintense signal on T2-weighted sequences in the whole brainstem, extended to the spinal cord (C2-C6), the left insula and the right cerebellum. When his blood pressure was controlled, his symptoms gradually improved. The follow-up MRI scan at 3 weeks revealed a dramatic regression of the hyperintense lesions on T2-weighted sequences. The differential diagnosis of PRES is very wide, especially in the case of conspicuous brainstem involvement. Treatable causes of white matter oedema should be always kept in mind to avoid misdiagnosis and prevent complications, such as intracranial haemorrhage.

BMJ case reports published new progress about Brain stem/cerebellum; neuro-oncology; neuroimaging; neurology; radiology. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Recommanded Product: Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Van der Lans, H. N. M. published the artcileDidehydrohetarenes. XXIII. Does 2,6-didehydropyridine exist, Recommanded Product: 2-Bromo-4-ethoxypyridine, the main research area is bromo aminopyridine piperidide; bromo aminoquinoline piperidide; pyridines bromo piperidide; quinoline bromo piperidide; didehydropyridine existence.

3-Amino-2-bromopyridine with Li piperidide gave pyrrole-3-carbonitrile; 4-amino-2-bromopyridine gave a ring-opened product (I); 5-amino-2-bromopyridine gave II and III; 6-amino-2-bromopyridine gave IV. 4-Amino-2-bromoquinoline gave V and VI. The intermediacy of 2,6-didehydropyridine in these reactions was discussed.

Tetrahedron Letters published new progress about bromo aminopyridine piperidide; bromo aminoquinoline piperidide; pyridines bromo piperidide; quinoline bromo piperidide; didehydropyridine existence. 17117-13-4 belongs to class pyridine-derivatives, name is 2-Bromo-4-ethoxypyridine, and the molecular formula is C7H8BrNO, Recommanded Product: 2-Bromo-4-ethoxypyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Morimoto, Kohkichi published the artcileBullous pemphigoid in patients receiving peritoneal dialysis: a case series and a literature survey., Formula: C17H18N2O6, the main research area is Bullous pemphigoid; hemodialysis; incidence; peritoneal dialysis.

Bullous pemphigoid (BP) is an autoimmune subepidermal blistering disease. Although several cases of BP in end-stage renal disease patients receiving peritoneal dialysis (PD) or hemodialysis have been reported, the incidence of BP in these patients remains unknown. We recently experienced three PD patients diagnosed with BP. The skin injury was likely to be a trigger of BP in all the three PD patients. Nifedipine and icodextrin exposures were possible factors directly or indirectly affecting the onset of BP, because they were common in the three cases. We also report that the incidence of BP in PD patients was 3/478.3 person-years in a single-center 10-year study. This case series with a literature survey describes that the skin and tissue injuries are potential triggers responsible for the onset of BP in dialysis patients and that the incidence of BP in these patients seems to be much higher than that in the general population.

Renal failure published new progress about Bullous pemphigoid; hemodialysis; incidence; peritoneal dialysis. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Formula: C17H18N2O6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Rivera-Gonzalez, Jonatahan published the artcileUse of Sublingual Nitrates for Management of Limb Ischemia Secondary to Inadvertent Intra-Arterial Buprenorphine/Naloxone (Suboxone®) Film Injection., Related Products of pyridine-derivatives, the main research area is Buprenorphine; Intravenous drug user; Limb ischemia; Naloxone; Nitroglycerine; Suboxone.

Multiple case reports have signaled a rise in buprenorphine abuse in the US, particularly among inmates. We present the case of limb ischemia secondary to accidental intra-arterial buprenorphine/naloxone film injection successfully treated with sublingual nitroglycerin. A 39-year-old man with history of intravenous drug use presented sudden severe left hand pain since three days prior to evaluation. Pain was preceded by self-injection of dissolved buprenorphine/naloxone sublingual film onto the affected arm. An arteriogram suggested severe vasoconstriction in the absence of frank thrombosis. Patient was initially treated with continuous heparin infusion and nifedipine. Forty-eight hours later, due to poor response, sublingual nitroglycerin was added to therapy. Digits regained color, sensation, and pain resolved within 15 minutes of administration of sublingual nitroglycerin. The presence of acute limb ischemia caused by prolonged vasospasm is a very rare complication. A normal angiogram should raise suspicion regarding vasospasm as the mechanism of ischemia, and prompt nitroglycerin therapy.

Puerto Rico health sciences journal published new progress about Buprenorphine; Intravenous drug user; Limb ischemia; Naloxone; Nitroglycerine; Suboxone. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Related Products of pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Suzuki, Yoshiaki published the artcileLocal Ca2+ Signals within Caveolae Cause Nuclear Translocation of CaMK1α in Mouse Vascular Smooth Muscle Cells., SDS of cas: 21829-25-4, the main research area is Ca2+/calmodulin-dependent kinase; L-type Ca2+ channel; caveola; fluorescence imaging; vascular smooth muscle cell.

An increase in intracellular Ca2+ concentration ([Ca2+]i) activates Ca2+-sensitive enzymes such as Ca2+/calmodulin-dependent kinases (CaMK) and induces gene transcription in various types of cells. This signaling pathway is called excitation-transcription (E-T) coupling. Recently, we have revealed that a L-type Ca2+ channel/CaMK kinase (CaMKK) 2/CaMK1α complex located within caveolae in vascular smooth muscle cells (SMCs) can convert [Ca2+]i changes to gene transcription profiles that are related to chemotaxis. Although CaMK1α is expected to be the key molecular identity that can transport Ca2+ signals originated within caveolae to the nucleus, data sets directly proving this scheme are lacking. In this study, multicolor fluorescence imaging methods were utilized to address this question. Live cell imaging using mouse primary aortic SMCs revealed that CaMK1α can translocate from the cytosol to the nucleus; and that this movement was blocked by nifedipine or a CaMKK inhibitor, STO609. Experiments using two types of Ca2+ chelators, ethylene glycol-bis(2-aminoethylether)-N,N,N’,N’-tetraacetic acid (EGTA) and 1,2-bis(2-aminophenoxy)ethane-N,N,N’,N’-tetraacetic acid (BAPTA), combined with caveolin-1 knockout (cav1-KO) mice showed that local Ca2+ events within caveolae are required to trigger this CaMK1α nuclear translocation. Importantly, overexpression of cav1 in isolated cav1-KO myocytes recovered the CaMK1α translocation. In SMCs freshly isolated from mesenteric arteries, CaMK1α was localized mainly within caveolae in the resting state. Membrane depolarization induced both nuclear translocation and phosphorylation of CaMK1α. These responses were inhibited by nifedipine, STO609, cav1-KO, or BAPTA. These new findings strongly suggest that CaMK1α can transduce Ca2+ signaling generated within or very near caveolae to the nucleus and thus, promote E-T coupling.

Biological & pharmaceutical bulletin published new progress about Ca2+/calmodulin-dependent kinase; L-type Ca2+ channel; caveola; fluorescence imaging; vascular smooth muscle cell. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, SDS of cas: 21829-25-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Reddy, Suryanarayana Challa published the artcileAmlodipine Induced Gum Hypertrophy: A Rare Case Report., Product Details of C17H18N2O6, the main research area is Calcium channel blockers; amlodipine; anticonvulsants; antihypertensive; drug induced gingival overgrowth; immunosuppressive.

BACKGROUND: DIGO or drug-induced gingival overgrowth occurs as a side effect of certain drugs. Until now, the etiology of drug-induced gingival overgrowth is not clearly understood. Among the calcium channel blockers, nifedipine has been shown to be most frequently associated with drug-induced gingival hyperplasia. Amlodipine is a comparatively newer calcium channel blocker that with a longer duration of action and lesser side effects as compared to nifedipine. There are only certain case reports of amlodipine-induced gum hyperplasia. CASE PRESENTATION: We report a case of amlodipine-induced gum hyperplasia in a 66-year-old hypertensive patient taking amlodipine at a dose of 5 mg once a day. There was significant regression of gum hypertrophy after substitution of amlodipine by Losartan. CONCLUSION: Amlodipine is one of the commonly prescribed antihypertensive drugs, and gingival hyperplasia is one overlooked side effect in patients taking amlodipine. Awareness of this potential side effect of amlodipine may be helpful to reduce the anxiety of patients and the cost of diagnostic procedures.

Current drug safety published new progress about Calcium channel blockers; amlodipine; anticonvulsants; antihypertensive; drug induced gingival overgrowth; immunosuppressive. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Product Details of C17H18N2O6.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Milliner, Brendan H A published the artcileEffect of Calcium-Channel Blockade on the Cold-Induced Vasodilation Response., Computed Properties of 21829-25-4, the main research area is calcium channel blockers; cold injury; environmental medicine; prevention and control.

INTRODUCTION: Cold-induced vasodilation (CIVD) is seen in the extremities during exposure to cold. A strong vasodilation response has been associated with a decreased risk of cold injury. Increasing CIVD might further decrease this risk. The calcium-channel blocker nifedipine causes vasodilation and is used to treat Raynaud’s syndrome and chilblains. Nifedipine is also used for high altitude pulmonary edema and could potentially serve a dual purpose in preventing frostbite. The effects of nifedipine on CIVD have not been studied. METHODS: A double-blind crossover study comparing nifedipine (30 mg SR (sustained release) orally twice daily) to placebo was designed using 2 sessions of 4 finger immersion in 5°C water, with 24 h of medication pretreatment before each session. Finger temperatures were measured via nailbed thermocouples. The primary outcome was mean finger temperature; secondary outcomes were mean apex and nadir temperatures, first apex and nadir temperatures, subjective pain ranking, and time of vasodilation onset (all presented as mean±SD). RESULTS: Twelve volunteers (age 29±3 [24-34] y) completed the study. No significant difference in finger temperature (9.2±1.1°C nifedipine vs 9.0±0.7°C placebo, P=0.38) or any secondary outcome was found. Pain levels were similar (2.8±1.6 nifedipine vs 3.0±1.5 placebo, P=0.32). The most common adverse event was headache (32% of nifedipine trials vs 8% placebo). CONCLUSIONS: Pretreatment with 30 mg of oral nifedipine twice daily does not affect the CIVD response in healthy individuals under cold stress.

Wilderness & environmental medicine published new progress about calcium channel blockers; cold injury; environmental medicine; prevention and control. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Computed Properties of 21829-25-4.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hoffmann, Tal published the artcilePainful diabetic neuropathy leads to functional Cav3.2 expression and spontaneous activity in skin nociceptors of mice, Application of Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, the main research area is painful diabetic neuropathy CaV expression spontaneous activity skin nociceptor; Calcitonin gene-related peptide; Excitability; Neuropathic pain; Neuropeptide release; Sciatic nerve; T-type calcium channel; TTA-P2.

Painful diabetic neuropathy occurs in approx. 20% of diabetic patients with underlying pathomechanisms not fully understood. We evaluated the contribution of the Cav3.2 isoform of T-type calcium channel to hyperglycemia-induced changes in cutaneous sensory C-fiber functions and neuropeptide release employing the streptozotocin (STZ) diabetes model in congenic mouse strains including global knockouts (KOs). Hyperglycemia established for 3-5 wk in male C57BL/6J mice led to major reorganizations in peripheral C-fiber functions. Unbiased electrophysiol. screening of mechanosensitive single-fibers in isolated hairy hindpaw skin revealed a relative loss of (polymodal) heat sensing in favor of cold sensing. In healthy Cav3.2 KO mice both heat and cold sensitivity among the C-fibers seemed underrepresented in favor of exclusive mechanosensitivity, low-threshold in particular, which deficit became significant in the diabetic KOs. Diabetes also led to a marked increase in the incidence of spontaneous discharge activity among the C-fibers of wildtype mice, which was reduced by the specific Cav3.2 blocker TTA-P2 and largely absent in the KOs. Evaluation restricted to the peptidergic class of nerve fibers – measuring KCl-stimulated CGRP release – revealed a marked reduction in the sciatic nerve by TTA-P2 in healthy but not diabetic wildtypes, the latter showing CGRP release that was as much reduced as in healthy and, to the same extent, in diabetic Cav3.2 KOs. These data suggest that diabetes abrogates all Cav3.2 functionality in the peripheral nerve axons. In striking contrast, diabetes markedly increased the KCl-stimulated CGRP release from isolated hairy skin of wildtypes but not KO mice, and TTA-P2 reversed this increase, strongly suggesting a de novo expression of Cav3.2 in peptidergic cutaneous nerve endings which may contribute to the enhanced spontaneous activity. De-glycosylation by neuraminidase showed clear desensitizing effects, both in regard to spontaneous activity and stimulated CGRP release, but included actions independent of Cav3.2. However, as diabetes-enhanced glycosylation is decisive for intra-axonal trafficking, it may account for the substantial reorganizations of the Cav3.2 distribution. The results may strengthen the validation of Cav3.2 channel as a therapeutic target of treating painful diabetic neuropathy.

Experimental Neurology published new progress about Axon. 21829-25-4 belongs to class pyridine-derivatives, name is Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, and the molecular formula is C17H18N2O6, Application of Dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Li, Q. Chan published the artcileValidation of a high-performance liquid chromatography method for the assay of and determination of related organic impurities in nevirapine drug substance, Application In Synthesis of 133627-45-9, the main research area is HPLC impurity determination nevirapine; liquid chromatog nevirapine impurity determination.

Nevirapine (Viramune), a dipyridiodiazepinone, is a potent and highly specific nonnucleoside inhibitor of HIV-1 reverse transcriptase. This study described the validation of a specific, sensitive, and a stability-indicating HPLC method for the determination of related organic impurities in nevirapine drug substance. This method used a Supelcosil LC-ABZ column, a mobile phase of 20:80 MeCN-pH 5.0 25-mM NH4H2PO4 and UV detection at 220 nm. This method was validated for specificity, linearity, accuracy, repeatability, detection limit, quantitation limit, stability of analyte solutions, robustness, and intermediate precision. Nevirapine was completely separated from all impurities. The method was linear with coefficients of determination >0.999. Average accuracy was 100.4% with a relative standard deviation of 0.7% for the assay. Accuracy ranges from 100.1 to 102.6% for related organic impurities. The repeatability was good, with relative standard deviations �.4%. The detection limit and the quantitation limit were 0.001 and 0.003%, resp. Relative response factors of known organic impurities were determined, permitting the use of nevirapine at the 0.1% level as an external standard for the quantitation of these impurities. Analyte solutions were stable for at least 2 days at ambient temperature The method was validated as robust, and intermediate precision was high. A system suitability test was developed and validated, and requirements were set. (c) 2000 Preston Publications.

Journal of Chromatographic Science published new progress about HPLC. 133627-45-9 belongs to class pyridine-derivatives, name is 2-Chloro-4-methylpyridin-3-amine, and the molecular formula is C6H7ClN2, Application In Synthesis of 133627-45-9.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Wollinger, Wagner published the artcileSimultaneous Determination of Assay and Related Substances in Nevirapine Suspension by HPLC, Name: 2-Chloro-4-methylpyridin-3-amine, the main research area is nevirapine impurity suspension HPLC UV detection.

The USP HPLC method for quant. determination of nevirapine in suspension formulations was evaluated to determine its ability to resolve nevirapine and its major related impurities. The method was modified and an overall satisfactory resolution for all components was obtained by changing the column temperature to 25°, the organic modifier to methanol, the mobile phase ratio to 50 %, adding 1% HCl into the diluents, decreasing the flow rate from 1.5 to 1.2 mL mL-1 and using an isocratic mode. The related organic impurities were synthesized in high yield. The method is shown to be linear with coefficient of determination around 0.999 to nevirapine (Nvp) and related impurities were resolved using a mobile phase of potassium phosphate/phosphoric acid buffer (pH 2.5; 10 mM)/methanol (50:50, volume/volume) on a BDS Hypersil C18 5 μm, 250 × 4.6 mm column. Accuracy ranged from 100.2 to 101.1 % and 100.0 to 100.5 % for nevirapine and related impurities, resp. Repeatability from all experiments achieved RSD values <0.95 %. The detection and quantification limits were determined in the level of ng mL-1. This method easily separated all known impurities synthesized and can be employed for routine anal. of suspension containing nevirapine in the presence of its impurities. Chromatographia published new progress about HPLC. 133627-45-9 belongs to class pyridine-derivatives, name is 2-Chloro-4-methylpyridin-3-amine, and the molecular formula is C6H7ClN2, Name: 2-Chloro-4-methylpyridin-3-amine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem