Asymmetric 1,3-dipolar cycloaddition of N-unprotected 2-oxoindolin-3-ylidene with azomethine ylides for the construction of spirooxindole-pyrrolidines bearing four contiguous stereogenic centers has been achieved with AgOAc/TF-BiphamPhos complexes for the first time. This catalytic system performance well over a broad scope of substrates, providing the synthetically useful adducts in high yields and excellent diastereoselectivities and moderate enantioselectivities.
首次实现了非保护性N-的2-氧
吲哚-3-
亚胺与偶氮
甲臜叶立德的不对称1,3-偶极环加成反应,用于构建含有四个相邻立体中心的手性螺环
吲哚啉-
吡咯烷类化合物,该反应采用了AgOAc/TF-BiphamPhos络合物作为催化剂。这一催化体系在广泛的底物范围内表现出色,以高产率、优异的非对映选择性和中等的手性选择性获得具有合成价值的加成产物。