Aza-Wittig reaction of N-vinylic phosphazenes with carbonyl compounds. Azadiene-mediated synthesis of dihydropyridines and pyridines
作者:Francisco Palacios、Gloria Rubiales
DOI:10.1016/0040-4039(96)01352-4
日期:1996.8
diphenylmethylphosphine 4 with carbonyl compounds leads to the formation of 2-azadienes derived from β-aminoacids 5. Dimerization of 2-azadienes 5c,d and reaction of compounds 5 with phosphazene 4 or enemine 6 affords substituted dihydropyridines 7 and 8. Aza-Wittig reaction of phosphazenes 4 with α,β-unsaturated aldehydes gives 3-azatrienes 12, which are easily converted into pyridines 13.
衍生自二苯基甲基膦4的N-乙烯基磷腈与羰基化合物的Aza-Wittig反应导致衍生自β-氨基酸5的2-氮杂二烯形成。2-氮杂二烯5c,d的二聚和化合物5与磷腈4或亚胺6的反应,得到取代的二氢吡啶7和8。磷腈4与α,β-不饱和醛的Aza-Wittig反应产生3-氮杂三酮12,该氮杂三氮烯12易于转化为吡啶13。