Diastereoselective Access to Tri- and Pentacyclic Spiro-γ-lactam-oxindole Cores through a Tandem Aza-Michael Initiated Ring Closure Sequence
作者:Iyad Allous、Sébastien Comesse、Morgane Sanselme、Adam Daïch
DOI:10.1002/ejoc.201100731
日期:2011.9
Herein, we present a new development of the previously described aza-Michael-initiated ring closure (MIRC) process to access spirooxindole cores. The key spiro-cyclization step between various α-bromoacetamides and methyleneindolinones was efficient and tolerant of a wide range of functional groups. Yields and diastereoselectivities for the spirocyclization were usually high and furnished original
在此,我们提出了先前描述的 aza-Michael 引发的闭环 (MIRC) 过程的新发展,以访问螺吲哚核心。各种α-溴乙酰胺和亚甲基吲哚酮之间的关键螺环化步骤是有效的,并且可以耐受多种官能团。螺环化的产率和非对映选择性通常很高,并提供原始的螺[oxindole-3,3'-γ-内酰胺]衍生物。四种五环螺环吲哚的制备证明了这些新型结构单元用于制备更复杂的衍生物的效用。