Construction of indolenine-substituted spiro[pyrrolidine-2,3′-oxindoles] from 2-alkenylindolenines and isatin-derived azomethine ylides
作者:Longchen Cui、Guodong Zhu、Siyuan Liu、Xiaoze Bao、Xiangyu Zhao、Jingping Qu、Baomin Wang
DOI:10.1016/j.tet.2018.03.059
日期:2018.5
An organic base-catalyzed 1,3-dipolar cycloaddition between 2-alkenylindolenines and azomethine ylides derivedfrom isatins and benzylamines was successfully developed to assemble indolenine-substituted spiro [pyrrolidine-2,3′-oxindole] ring systems. Generally, good regioselectivities (up to 14:1 rr) and high yields (up to 91%) were obtained under mild conditions.
Assembly of Indolenines, 3-Amino Oxindoles, and Aldehydes into Indolenine-Substituted Spiro[pyrrolidin-2,3′-oxindoles] via 1,3-Dipolar Cycloaddition with Divergent Diastereoselectivities
作者:Guodong Zhu、Siyuan Liu、Shiqi Wu、Lianghong Peng、Jingping Qu、Baomin Wang
DOI:10.1021/acs.joc.7b00316
日期:2017.4.21
A novel one-pot 1,3-dipolar cycloaddition of indolenines, 3-aminooxindoles, and aldehydes is reported. The reaction provides indolenine-substituted spiro[pyrrolidin-2,3′-oxindoles] containing four contiguous stereogenic centers in high yields (up to 99%) and excellent diastereoselectivities (up to >20:1 dr) under mild conditions. Remarkably, the inversion of diastereoselectivity could be readily achieved