133595-50-3Relevant articles and documents
Reaction of N-vinylic phosphazenes with α,β-unsaturated aldehydes. Azatriene-mediated synthesis of dihydropyridines and pyridines derived from β-amino acids
Palacios, Francisco,Herran, Esther,Alonso, Concepcion,Rubiales, Gloria,Lecea, Begona,Ayerbe, Mirari,Cossio, Fernando P.
, p. 6020 - 6030 (2006)
Aza-Wittig reaction of N-vinylic phosphazenes (1,2 addition), derived from diphenylmethylphosphine or derived from trimethylphosphine with α,β-unsaturated aldehydes, leads to the formation of 3-azatrienes through a [2 + 2]-cycloaddition-cycloreversion sequence. The presence of an alkyl substituent in position 3 of N-vinylic phosphazenes increases the steric interactions, and [4 + 2] periselectivity (1,4 addition) is observed. Reaction of azatrienes with α,β-unsaturated aldehydes yields pyridines.
Synthesis of 3,4-dihydropyrimidin-2(1H)-ones and 1,4-dihydropyridines using ammonium carbonate in water
Tamaddon, Fatemeh,Razmi, Zahra,Jafari, Abbas Ali
experimental part, p. 1187 - 1189 (2010/04/23)
Various known and new 3,4-dihydropyrimidin-2(1H)-ones and 1,4-dihydropyridines are prepared efficiently via Biginelli and Hantzsch reactions using ammonium carbonate in water. Competition between Biginelli and Hantzsch reactions is observed with pyridine carbaldehydes. Using this methodology, Hantzsch esters are synthesized in higher yields and purities than with other procedures without the use of a catalyst or an organic solvent.
'In situ' generated 'HCl' - An efficient catalyst for solvent-free Hantzsch reaction at room temperature: Synthesis of new dihydropyridine glycoconjugates
Sharma,Reddy, K. Laxmi,Lakshmi, P. Sree,Krishna, Palakodety Radha
, p. 55 - 58 (2007/10/03)
HCl, generated in situ from 2,4,6-trichloro[1,3,5]triazine (TCT, cyanuric chloride), catalyzed a solvent free Hantzsch reaction at room temperature with enhanced reaction rates. The reaction conditions allow facile preparation of glycoconjugates of dihydr