Synthesis of heterocyclic compounds using amidines as their ene-1,1-diamine tautomers. I. Synthesis of 4,5-dihydro-3<i>H</i>-pyridin-2-one, 3,4-dihydropyrrol-2-one and 1,3-dihydropyrrol-2-one derivatives by the reaction of amidines with α,β-unsaturated esters
作者:Kunio Ito、Yoshiko Kizuka、Yuji Hirano
DOI:10.1002/jhet.5570420417
日期:2005.5
4,5-dihydro-3H-pyridin-2-one derivatives 5. Michael addition of the acetamidines 1 as their ene-1,1-diamine tautomers 1′ to 2 and the subsequent cyclization of the adducts gave derivatives 5. Amidines 1 on reaction with trimethyl ethylenetri-carboxylate (9) or dimethyl acetylenedicarboxylate (12) afforded 3,4-dihydropyrrol-2-one 11 or 1,3-dihy-dropyrrol-2-one derivatives 13.
ñ -吨-Butylacetamidines 1上与丙烯酸甲酯(加热2)在200℃,得到4,5-二氢-3- ħ -吡啶-2-酮衍生物5。乙am 1作为它们的ene-1,1-二胺互变异构体1 '到2的迈克尔加成反应,随后加合物的环化反应得到衍生物5。idine 1与三羧酸三甲酯(9)或乙炔二甲酸二甲酯(12)反应,得到3,4-二氢吡咯-2-酮11或1,3-二氢-吡咯-2-酮衍生物13。