N-Trimethylsilyloxyenamines as new aldehyde enolate synthons: general, efficient and diastereoselective aldol reaction with ketals and acetals
作者:Manoj R. Sonawane、Ivana Císařová、Ilya M. Lyapkalo
DOI:10.1039/b924880c
日期:——
(E)-N-Trimethylsilyloxyenamines, easily accessible from aldonitrones, proved to be excellent nucleophiles in TMSOTf-induced diastereoselective aldol reaction, both with ketals and acetals, proceeding via an extended transition state and leading to a new aldol C–C-bond in the aldonitrone products, that can be readily hydrolysed to the corresponding aldehydes.
(E)-N-三甲基硅氧基烯胺,易于从醛亚胺合成,被证明在TMSOTf诱导的立体选择性醇缩反应中是优秀的亲核试剂,既可以与凯他尔(ketals)反应,也可以与乙缩醛(acetals)反应,反应通过一个扩展的过渡态进行,并在醛亚胺产物中形成一个新的醇缩C-C键,这个键可以容易地水解成相应的醛。