(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。