Modified McFadyen–Stevens reaction for a versatile synthesis of aliphatic/aromatic aldehydes: design, optimization, and mechanistic investigations
作者:Yuri Iwai、Takashi Ozaki、Ryo Takita、Masanobu Uchiyama、Jun Shimokawa、Tohru Fukuyama
DOI:10.1039/c2sc22045h
日期:——
The traditional McFadyen–Stevens reaction requires harsh alkaline reaction conditions, thus precluding application to the synthesis of aliphatic aldehydes. Our modified McFadyen–Stevens reaction enables the transformation from the N,N-acylsulfonyl hydrazine to the corresponding aldehyde upon treatment with an imidazole–TMS imidazole combination without relying on oxidative or reductive reagents. The
传统的McFadyen–Stevens反应需要苛刻的碱性反应条件,因此无法用于脂肪族醛的合成。经过改良的McFadyen–Stevens反应,在不依赖氧化剂或还原剂的情况下,通过咪唑–TMS咪唑组合处理,可以将N,N-酰基磺酰基肼转化为相应的醛。所得醛的降低的碱性和原位保护扩大了底物范围,以包括脂族醛,甚至包括带有α-氢原子的脂族醛。结合理论上的考虑,仔细检查特定底物的副反应 DFT的计算使人们对涉及酰基二氮烯和羟基卡宾作为合理中间体的McFadyen–Stevens反应有了机械的理解。