Synthesis of heterocyclic compounds using amidines as their ene-1,1-diamine tautomers. II. Synthesis of 2,3-dihydropyridine, 3,4-dihydropyridine and 3,4-dihydropyrrol-2-one derivatives by the reaction of amidines with α, β-unsaturated carbonyl compounds
作者:Kunio Ito、Yoshiko Kizuka、Shogo Ihara
DOI:10.1002/jhet.5570430512
日期:2006.9
crotonaldehyde gave the 2,3-dihydropyridine derivatives 4,5 or 6 via N-alkylation of the acetamidines 1. Reaction of amidines 1 with phenyl 1-propenyl ketone, benzalacetone or chalcone gave 3,4-dihydropyridine derivatives 8, 9 or 10. These were obtained by C-alkylation, achieved by Michael addition of the acetamidines 1 as their N,C-tautomers ene-1,1-diamines 1′ to α,β-unsaturated carbonyl compounds, and subsequent
NT -Butylacetamidines 1与甲基乙烯基酮,丙烯醛或巴豆醛加热,得到2,3-二氢吡啶衍生物4,5或6 经N个所述acetamidines的烷基化1。idine 1与苯基1-丙烯基酮,苯并丙酮或查尔酮的反应得到3,4-二氢吡啶衍生物8、9或10。这些被获得Ç烷基化,由Michael加成的acetamidines的实现1作为其N,C -tautomers烯-1,1-二胺1 '到α,β不饱和羰基化合物,以及加合物的后续环化脱水。的反应用丙烯酸3-苯甲酰基乙酯1,得到3,4-二氢吡咯-2-酮衍生物13。