The [3 + 2] annulation reaction of C,C,N-trisubstituted ketenimines with donor–acceptorcyclopropanes bearing aryl, styryl and vinyl substituents at the C2 position, triggered by the Lewisacid Sc(OTf)3, supplies highly substituted pyrrolidines. Activated cyclopropanes fused to naphthalene and [1]benzopyrane nuclei are also suitable substrates in similar transformations, yielding partially saturated
由路易斯酸Sc(OTf)3引发的C,C,N-三取代的酮亚胺与供体-受体环丙烷在C2位置带有芳基,苯乙烯基和乙烯基取代基的[3 + 2]环化反应提供了高度取代的吡咯烷。与萘和[1]苯并吡喃核融合的活化环丙烷也是类似转化的合适底物,产生部分饱和的苯并[ g ]吲哚和[1]苯并吡喃[4,3- b ]吡咯。还开发了这种酮亚胺/环丙烷[3 + 2]环糊剂的分子内版本,从而形成了吡咯并[2,1- a ]异吲哚骨架。
An Unprecedented Chemospecific and Stereoselective Tandem Nucleophilic Addition/Cycloaddition Reaction of Nucleophilic Carbenes with Ketenimines
作者:Ying Cheng、Yang-Guang Ma、Xiao-Rong Wang、Jun-Ming Mo
DOI:10.1021/jo802289s
日期:2009.1.16
study of the reaction between nucleophilic carbenes and ketenimines is reported. The interaction of thiazole and benzothiazole carbenes with ketenimines proceeded in a chemospecific and stereoselective manner to produce thiazole- and benzothiazole-spiro-pyrrole derivatives generally in good yields. The reaction was proposed to proceed via a tandem nucleophilicaddition of carbene to the C═N bond of