Regio- and Stereocontrol Elements in Rh(II)-Catalyzed Intramolecular C−H Insertion of α-Diazo-α-(phenylsulfonyl)acetamides
作者:Cheol Hwan Yoon、Michael J. Zaworotko、Brian Moulton、Kyung Woon Jung
DOI:10.1021/ol016647l
日期:2001.11.1
see text]. Intramolecular C-H insertion reaction of alpha-diazo-alpha-(phenylsulfonyl)acetamides proceeded with high regio- and stereoselectivities to afford highly functionalized gamma-lactams predominantly or exclusively. The high regioselectivity was attributed to the use of the phenylsulfonyl moiety, which altered electron density at the carbenoid center and exerted a steric effect during the insertion
[反应:请参见文字]。α-重氮-α-(苯磺酰基)乙酰胺的分子内CH插入反应具有较高的区域选择性和立体选择性,从而主要或专门提供高度官能化的γ-内酰胺。高区域选择性归因于苯基磺酰基部分的使用,该部分改变了类胡萝卜素中心的电子密度并在插入反应过程中产生了空间效应。本文还描述了确定区域选择性的三个控制元素,它们是酰胺构象,立体电子和取代基效应。