Iron-catalyzed kinetic resolution of N-sulfonyl oxaziridines
作者:Kevin S. Williamson、James W. Sawicki、Tehshik P. Yoon
DOI:10.1039/c4sc01371a
日期:——
We have developed a highly selective kinetic resolution of N-sulfonyl oxaziridines. This reaction utilizes an inexpensive and easily synthesized iron bis(oxazoline) catalyst to promote the efficient rearrangement of oxaziridines to the corresponding N-sulfonyl imides; no sacrificial reagents are required to effect this resolution. This process is readily translated to gram scale, which provides a practical method for the preparation of structurally diverse, enantiopure N-sulfonyl oxaziridines for use as reagents in organic synthesis.
Iodide as an Activating Agent for Acid Chlorides in Acylation Reactions
作者:Russell J. Wakeham、James E. Taylor、Steven D. Bull、James A. Morris、Jonathan M. J. Williams
DOI:10.1021/ol400035f
日期:2013.2.1
Acid chlorides can be activated using a simple iodide source to undergo nucleophilic attack from a variety of relatively weak nucleophiles. These include Friedel–Crafts acylation of N-methylpyrroles, N-acylation of sulfonamides, and acylation reactions of hindered phenol derivatives. The reaction is believed to proceed through a transient acidiodide intermediate.