作者:Quanrui Wang、Atef Amer、Susanne Mohr、Eveline Ertel、Johannes C Jochims
DOI:10.1016/s0040-4020(01)80194-0
日期:1993.1
Hydrazones of ketones 1, are transformed into 1-chloroalkylazo compounds, 2, which react with Lewis acids to give transient 1-aza-2-azoniaallene salts, 3. The cations 3 react with with acetylenes, olefins, isocyanates, carbodiimides, and nitriles under [3+2]-cycloadditions. The cycloadducts undergo consecutive reactions, e.g. [1,2]-shifts of alkyl groups.
将酮1的转化为1-氯烷基偶氮化合物2,该化合物与路易斯酸反应生成瞬态1-aza-2-azoniaallene盐3。阳离子3在[3 + 2]-环加成下与乙炔,烯烃,异氰酸酯,碳二亚胺和腈反应。环加合物经历连续反应,例如烷基的[1,2]移位。