Tag: M.W=150-200

Nimje, Roshan Y.; Vytla, Devaiah; Kuppusamy, Prakasam; Velayuthaperumal, Rajeswari; Jarugu, Lokesh Babu; Reddy, China Anki; Chikkananjaiah, Nanjundaswamy Kanikahalli; Rampulla, Richard A.; Cavallaro, Cullen L.; Li, Jianqing; Mathur, Arvind; Gupta, Anuradha; Roy, Amrita published the artcile< Synthesis of differentially protected azatryptophan analogs via Pd2(dba)3/XPhos catalyzed Negishi coupling of N-Ts azaindole halides with zinc derivative from Fmoc-protected tert-butyl (R)-2-amino-3-iodopropanoate>, Category: pyridine-derivatives, the main research area is azatryptophan protected synthesis; azaindole tosyl halide Negishi coupling aminoiodopropanoate zinc.

Unnatural amino acids play an important role in peptide based drug discovery. Herein, we report a class of differentially protected azatryptophan derivatives synthesized from N-tosyl-3-haloazaindoles (I) (Pg = protective groups: Ts (tosyl), Fmoc (9-fluorenylmethoxycarbonyl), and tert-Bu) and Fmoc-protected tert-Bu iodoalanine (II) (Fmoc = 9-fluorenylmethoxycarbonyl) via a Negishi coupling. Through ligand screening, Pd2(dba)3/XPhos was found to be a superior catalyst for the coupling of 1 with the zinc derivative of 2 to give tert-Bu (S)-2-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-3-(1-tosyl-1H-pyrrolo[2,3-b]pyridin-3-yl)propanoate derivatives (III) (Pg = protective groups: Ts, Fmoc, and tert-Bu; Fmoc = 9-fluorenylmethoxycarbonyl) in 69-91% isolated yields. In addition, we have demonstrated that the protecting groups, namely, Ts, Fmoc, and tert-Bu, can be easily removed selectively.

Journal of Organic Chemistry published new progress about (Fluorenylmethoxy)carbonyl group. 23612-36-4 belongs to class pyridine-derivatives, and the molecular formula is C7H5BrN2, Category: pyridine-derivatives.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Sasiadek, Wojciech; Bryndal, Iwona; Lis, Tadeusz; Wandas, Maria; Hanuza, Jerzy published the artcile< Synthesis and physicochemical properties of the methyl-nitro-pyridine-disulfide: X-ray, NMR, electron absorption and emission, IR and Raman studies and quantum chemical calculations>, Computed Properties of 19346-45-3, the main research area is methyl nitro pyridine disulfide preparation crystal structure IR NMR.

The methyl-nitro-pyridine-disulfide derivative [2,2′-disulfanodiylbis(6-metyl-3-nitropyridine)] was synthesized and characterized by means of structural and spectroscopic measurements. On the basis of X-ray diffraction studies, it was found that the studied compound crystallizes in the centrosym. monoclinic space group P21/n (Z = 2). The disulfide C-S-S-C bridge links two identical fragments formed by pyridine rings substituted with Me and nitro groups. Such a structure was confirmed by 1H and 13C NMR studies as well as IR, Raman, UV-VIS and emission spectra. Quantum chem. DFT calculations were applied in the anal. of the obtained results. The vibrational characteristics were reported and dynamical properties of this moiety were discussed. A full set of the normal modes characteristic for the disulfide bridge was identified and assigned to the resp. IR and Raman bands. The results of structural and spectroscopic studies were used to find the dependence between the conformation of the Φ-S-S-Φ system and its optic properties. The exptl. electron and emission spectra were analyzed in terms of the calculated singlet and triplet states that allowed assigning the unique spectral pattern originating from the electrons of the C-S-S-C bridge system.

Journal of Molecular Structure published new progress about Aromatic compounds, disulfides Role: PRP (Properties), SPN (Synthetic Preparation), PREP (Preparation). 19346-45-3 belongs to class pyridine-derivatives, and the molecular formula is C6H5FN2O2, Computed Properties of 19346-45-3.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Hikawa, Hidemasa; Nakayama, Taku; Nakamura, Shunki; Kikkawa, Shoko; Azumaya, Isao published the artcile< Dehydrative amination of benzhydrols with electron-withdrawing group-substituted 2-aminopyridines utilizing Au(III)/TPPMS catalyst system in water>, Synthetic Route of 22280-62-2, the main research area is benzyl aminopyridine preparation; benzhydrol aminopyridine dehydrative amination gold sodium diphenylphosphinobenzene sulfonate water.

Authors report a method for gold(III)/sodium diphenylphosphinobenzene-3-sulfonate (TPPMS)-catalyzed direct amination of benzhydrols using 2-aminopyridines with poor nucleophilic character in water. Various functional groups such as electron-withdrawing nitro, cyano and halogen groups were tolerated well to form the desired N-benzylated 2-aminopyridine compounds On the basis of mechanistic studies including kinetic profiles, Hammett study and isotope effects, authors propose a pathway in which a Lewis acidic gold cation species activates the sp3 C-O bond of the alc. in the rate-determining step.

Organic & Biomolecular Chemistry published new progress about Amination (dehydrative). 22280-62-2 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Synthetic Route of 22280-62-2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Constable, Edwin C.; Housecroft, Catherine E. published the artcile< The early years of 2,2'-bipyridine-a ligand in its own lifetime>, Electric Literature of 366-18-7, the main research area is 2,2’-bipyridine; coordination chemistry; history; supramolecular chemistry; synthesis.

The first fifty years of the chem. of 2,2′-bipyridine are reviewed from its first discovery in 1888 to the outbreak of the second global conflict in 1939. The coordination chem. and anal. applications are described and placed in the context of the increasingly sophisticated methods of characterization which became available to the chemist in this time period. Many of the “”simple”” complexes of 2,2′-bipyridine reported in the early literature have been subsequently shown to have more complex structures.

Molecules published new progress about 366-18-7. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Electric Literature of 366-18-7.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Blache, Yves; Gueiffier, Alain; Chavignon, Olivier; Viols, Henry; Teulade, Jean Claude; Chapat, Jean Pierre published the artcile< Compared reactivity of 3-, 5-, 6-, and 8-aminoimidazo[1,2-α]pyridines in Combes reaction: access to imidazonaphthyridines and dipyrido[1,2-a:3',2'-d]imidazole>, Application of C6H7N3O2, the main research area is aminoimidazopyridine Combes reaction; imidazonaphthyridine; dipyridoimidazole.

The synthesis of imidazo[1,2-a][1,8]naphthyridines and dipyrido[1,2-a:3′,2′-d]imidazole by treatment of aminoimidazo[1,2-a]pyridines following the Combes procedure is described.

Heterocycles published new progress about 22280-62-2. 22280-62-2 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Application of C6H7N3O2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Mendes, Rodrigo A.; de Freitas, Renato G.; Brown, Alex; de Souza, Gabriel L. C. published the artcile< Exploring ground and low-lying excited states for diquat, paraquat, and dipyridyl isomers>, SDS of cas: 581-47-5, the main research area is diquat paraquat dipyridyl isomer ground excited state.

In this work, we present a computational investigation on diquat, paraquat, and six dipyridyl isomers (2,2′-dipyridyl, 2,3′-dipyridyl, 2,4′-dipyridyl, 3,3′-dipyridyl, 3,4′-dipyridyl, and 4,4′-dipyridyl). Ground state properties such as equilibrium structures, relative energetics, transition states for cis-trans interconversion, and vibrational frequencies were determined for all the isomers at the MP2 level of theory with the cc-pVTZ basis set in the gas-phase; the MP2/cc-pVTZ and MP2/6-311+G(d,p) levels of theory in water were employed for diquat and paraquat. The trans structures are the most stable ones among the compounds that present such isomeric forms, with relative energies of 6.24 kcal/mol, 0.61 kcal/mol, and 0.12 kcal/mol lower than the cis counterparts in 2,2′-dipyridyl, 2,3′-dipyridyl, and 3,3′-dipyridyl, resp. The transition state lies at 7.65 kcal/mol above the trans form in the case of 2,2′-dipyridyl, 3.68 kcal/mol for 2,3′-dipyridyl, and 2.02 kcal/mol for 3,3′-dipyridyl, indicating that the interconversion is feasible in the cases of 2,3′-dipyridyl and 3,3′-dipyridyl and unlikely to occur in 2,2′-dipyridyl at room temperature Vertical excitation energies and resp. generalized oscillator strengths (GOS) were determined using time-dependent d. functional theory (CAM-B3LYP/cc-pVTZ and PBE0/cc-pVTZ) and EOM-CCSD/cc-pVTZ. In terms of excitation (and independent of computational method), all the isomers except 4,4′-dipyridyl, presented excited electronic states that are both bright (with GOS > 0.1) and energetically accessible at UV-vis wavelengths. Two bright states were found for diquat and paraquat in the UV region. Therefore, we expect that photoinduced degradation of both compounds can benefit from the utilization of techniques combining more than one source of radiation.

Journal of Photochemistry and Photobiology, A: Chemistry published new progress about Cis-trans isomerization. 581-47-5 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, SDS of cas: 581-47-5.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Luo, Lihua; Tang, Juan; Sun, Rui; Li, Wenjing; Zheng, Xueli; Yuan, Maoling; Li, Ruixiang; Chen, Hua; Fu, Haiyan published the artcile< Direct C-H Sulfonylimination of Pyridinium Salts>, Recommanded Product: 2,4-Bipyridine, the main research area is sulfonyl iminopyridine preparation; pyridinium salt arylsulfonyl azide sulfonylimination.

A direct pyridinium C-H sulfonylimination has been developed for the synthesis of sulfonyl iminopyridine derivatives I (R = H, CN, Ph, thiophen-2-yl, etc.; R1 = H, OMe, Ph, thiophen-3-yl, etc.; R2 = H, cyclopropyl, Ph, 4-bromophenyl, etc.; R1R2 = -CH=CH-CH=CH-; R3 = Me, Et, i-Pr, etc.; R4 = Et, Ph, pyridin-3-yl, etc.) with high efficiency. This transformation features the direct and efficient formation of a C=N bond with a high functional group tolerance under metal-free conditions. The spectroscopic properties potentially enable these sulfonyl iminopyridine compounds I to be useful new emitting materials.

Organic Letters published new progress about Azides, sulfonyl azides Role: RCT (Reactant), SPN (Synthetic Preparation), RACT (Reactant or Reagent), PREP (Preparation). 581-47-5 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, Recommanded Product: 2,4-Bipyridine.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Tunca, Ekrem; Bulbul, Metin; Ilkimen, Halil; Canlidinc, Rukiye Saygili; Yenikaya, Cengiz published the artcile< Investigation of the effects of the proton transfer salts of 2-aminopyridine derivatives with 5-sulfosalicylic acid and their Cu(II) complexes on cancer-related carbonic anhydrases: CA IX and CA XII>, Reference of 21901-29-1, the main research area is cancer sulfosalicylic acid aminopyridine carbonic anhydrase IX XII.

Abstract: Six novel proton transfer compounds (15-20) obtained from 5-sulfosalicylic acid (1) and 2-aminopyridine derivatives [2-amino-3-benzyloxypyridine (2), 2-amino-3-hydroxylpyridine (3), 2-amino-3-methylpyridine (4), 2-amino-3-nitropyridine (5), 2-amino-3-nitro-4-methylpyridine (6) and 2-amino-3-nitro-6-methylpyridine (7)] and their Cu(II) complexes (21-26) along with the Cu(II) complexes of 2-7 (9-14) have been prepared and characterized by spectroscopic techniques. The in vitro inhibition effects of all compounds on CA IX and CA XII isoenzymes as well as on hCA I and hCA II were investigated and the results were compared. The inhibition studies showed that the synthesized compounds are more selective to CA XII isoenzyme. The hydratase IC50 values of the compounds were determined as in the range of 15.61 ± 2.32 uM-99.02 ± 4.99 uM for hCA I, 22.36 ± 0.75 uM-77.03 ± 4.03 uM for hCA II, 23.90 ± 1.67 uM-138.63 ± 5.45 uM for CA IX, and 9.50 ± 1.16 uM-693.15 ± 8.96 uM for CA XII. The inhibition data have been analyzed using one-way anal. of variance for multiple comparisons (p < 0.0001). Chemical Papers published new progress about Enzyme inhibition kinetics. 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Reference of 21901-29-1.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Al-Busaidi, Idris Juma; Ilmi, Rashid; Zhang, Danyang; Dutra, Jose D. L.; Oliveira, Willyan F.; Al Rasbi, Nawal K.; Zhou, Liang; Wong, Wai-Yeung; Raithby, Paul R.; Khan, Muhammad S. published the artcile< Synthesis and photophysical properties of ternary β-diketonate europium(III) complexes incorporating bipyridine and its derivatives>, COA of Formula: C10H8N2, the main research area is trifluoromethyl phenyl butanedione phenylethynyl bromo bipyridine europium preparation photophys; ternary beta diketonate europium bipyridine preparation photophys photoluminescence.

Two new octa-coordinated ternary europium(III) complexes of the type [Eu(btfa)3(Br2-bpy)] (Eu-1) and [Eu(btfa)3(PhE2-bpy)] (Eu-2) (where btfa = 4,4,4-trifluoro-1-phenyl-1,3-butanedione, Br2-bpy = 5,5′-dibromo-2,2′-bipyridine, PhE2-bpy 5,5′-bis(phenylethynyl)-2,2′-bipyridine) together with a previously reported complex [Eu(btfa)3(bpy)] (Eu-3) have been synthesized. The complexes have been characterized by anal. and spectroscopic methods. The photophys. properties of the complexes have also been analyzed both exptl. and theor. The contribution of each ligand to the sensitized Eu(III) photoluminescence (PL) has been analyzed and is discussed. An energy transfer (ET) mechanism is proposed and discussed for the sensitized Eu(III) emission using exptl. and theor. data. The Eu(III) complex incorporating the parent bpy showed impressive performance as a double-emitting layer (EML) red organic light emitting diodes (R-OLEDs).

Dyes and Pigments published new progress about Crystal structure. 366-18-7 belongs to class pyridine-derivatives, and the molecular formula is C10H8N2, COA of Formula: C10H8N2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Singh, Malvinder P.; Bathini, Yadagiri; Lown, J. William published the artcile< Site selective alkoxymethylation of imidazo[4,5-b]pyridines: structural analysis by high field NMR methods>, Product Details of C6H7N3O2, the main research area is alkylation alkoxymethylation imidazopyridine regiochem; aryl imidazopyridine preparation structure; tautomer nucleophile alkoxymethylation regiochem imidazopyridine; solvent effect alkoxymethylation benzimidazole methoxyphenyl; benzimidazole alkoxymethyl methoxyphenyl mol structure; mol structure alkoxymethyl methoxyphenyl imidazopyridine.

The alkylation reactions of 2-aryl-1(3)H-imidazo[4,5-b]pyridines (equivalent to 1-deazapurines) with alkoxymethyl chlorides and bromoacetonitrile are described. The structural assignments of the products were made using 2-dimensional 1H-1H NOE (NOESY) and selective INEPT (INAPT) 13C NMR experiments using polarization transfer from C-bound hydrogens in the alkyl side chains to selected 13C resonances via long-range 3JCH couplings. Although 3 isomeric N-alkyl derivatives could arise from a single heterocycle based on considerations of tautomeric equilibrium, however, the reactions exhibit marked site selectivity even under quite different reaction conditions. Thus, N-3 alkyl derivatives are produced exclusively in basic (Et3N/NaH) nonpolar media following an SEE2cB mechanism. Solvent effects are evident in a loss of N-3 vs. N-1 selectivity for alkylation when the polar aprotic solvent DMF is used. Under neutral conditions direct alkylation occurs at the N-4 position following an SE2′ mechanism. The overall site selectivity appears to be governed by the relative reactivity of individual nucleophilic sites rather than the tautomeric composition in solution The regioselective alkoxymethylation of 2-(4-methoxyphenyl)benzimidazole, and methyl-2-(4-methoxyphenyl)imidazopyridines I (R = hydrogen, methyl; X = CH, N) were reported. Bis(imidazo[4,5-b]pyridine analogs of Hoechst 33258 were prepared

Heterocycles published new progress about Molecular structure. 21901-29-1 belongs to class pyridine-derivatives, and the molecular formula is C6H7N3O2, Product Details of C6H7N3O2.

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem