Reaction of difluorocarbene with 2H-azirines: generation and transformations of strained azomethine ylides — aziriniodifluoromethanides
作者:A. F. Khlebnikov、M. S. Novikov、A. A. Amer
DOI:10.1023/b:rucb.0000041305.50408.ed
日期:2004.5
The reaction of difluorocarbene with azirines affords a new type of azomethine ylides, viz., strained aziriniodifluoromethanides. 1,3-Dipolar cycloadditions of ylides derived from 2-unsubstituted 3-arylazirines to dimethyl acetylenedicarboxylate and aldehydes give derivatives of 2,2-difluoro-1-azabicyclo[3.1.0]hex-3-ene-3,4-dicarboxylic acids and 1,4-oxazin-3(4H)-ones, respectively. Ylides derived
二氟卡宾与氮丙啶的反应提供了一种新型的偶氮甲碱叶立德,即应变的氮丙啶二氟甲烷。由 2-未取代的 3-芳基氮丙啶衍生的叶立德与乙炔二羧酸二甲酯和醛的 1,3-偶极环加成得到 2,2-二氟-1-氮杂双环[3.1.0]己-3-烯-3,4-二羧酸的衍生物和 1,4-oxazin-3(4H)-ones,分别。衍生自 2-单-和 2,2-二取代的氮丙啶的叶立德经历异构化为 2-氮杂-1,3-二烯衍生物。2,2-二氟-1-氮杂双环[3.1.0]己-3-烯以高产率转化为2-氟吡啶衍生物并与胺反应生成2,4-二氨基-1-氮杂双环[3.1.0]己-2-烯衍生物。