Kos, Pavlo et al. published their research in Advanced Synthesis & Catalysis in 2013 | CAS: 85838-94-4

tert-Butyl 5,6-dihydropyridine-1(2H)-carboxylate (cas: 85838-94-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. SDS of cas: 85838-94-4

Fast olefin metathesis: synthesis of 2-aryloxy-substituted Hoveyda-type complexes and application in ring-closing metathesis was written by Kos, Pavlo;Savka, Roman;Plenio, Herbert. And the article was included in Advanced Synthesis & Catalysis in 2013.SDS of cas: 85838-94-4 This article mentions the following:

Compounds I (R = NMe2, H, Cl, NO2) were reacted with the ruthenium complexes [RuCl2(NHC)(3-phenylindenylidene)(py)] in the presence of a protic resin to result in the formation of the resp. Hoveyda-type complexes II (R = NMe2, H, Cl, NO2) and III (R = NMe2, H, Cl, NO2) in 66-84% yield. The lower steric bulk and the decreased donation of the diaryl ether oxygen atoms in complexes II and III led to rapidly initiating precatalysts. The Ru(II/III) redox potentials of complexes III were determined (ΔE=0.89-1.08 V). In the crystal structure of II (R = H) two independent mols. were observed in the unit cell, displaying Ru-O distances of 226.6(4) and 230.5(3) pm. The catalytic performance of complexes 5 and 6 in various ring-closing metathesis (RCM) reactions was studied. Catalyst loadings of between 15-200 ppm are sufficient for the formation of >90% yield of the resp. cyclic products. Complex III (R = H) catalyzes the formation of N-protected 2,5-dihydropyrroles with up to TON 64,000 and TOF 256,000 h-1, of the N-protected 1,2,3,6- tetrahydropyridines with up to TON 18,200 and TOF 73,000 h-1 and of the N-protected 2,3,6,7-tetrahydroazepines with up to TON 8,100 and TOF 32,000 h-1 with yields ranging between 77 and 96%. In the experiment, the researchers used many compounds, for example, tert-Butyl 5,6-dihydropyridine-1(2H)-carboxylate (cas: 85838-94-4SDS of cas: 85838-94-4).

tert-Butyl 5,6-dihydropyridine-1(2H)-carboxylate (cas: 85838-94-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Reduced pyridines, namely tetrahydropyridines, dihydropyridines and piperidines, are found in numerous natural and synthetic compounds. The synthesis and reactivity of these compounds have often been driven by the fact many of these compounds have interesting and unique pharmacological properties. SDS of cas: 85838-94-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem