Enantioselective Diels−Alder Reactions with <i>N</i>-Hydroxy-<i>N</i>-phenylacrylamide
作者:Olivier Corminboeuf、Philippe Renaud
DOI:10.1021/ol025799t
日期:2002.5.1
[reaction: see text] The use of hydroxamic acids as templates for Lewis acid catalyzed enantioselective Diels-Alder reactions has been examined. A very simple chiral Lewis acid, prepared by mixing optically pure binaphthol with 3 equiv of trimethylaluminum, catalyzes the [4 + 2] cycloaddition of N-hydroxy-N-phenylacrylamide with cyclopentadiene at 0 degrees C in high yield (>96%) and with a fairly
[反应:见正文]研究了使用异羟肟酸作为路易斯酸催化的对映选择性Diels-Alder反应的模板。通过将光学纯的联萘酚与3当量的三甲基铝混合而制得的非常简单的手性路易斯酸,可在0℃以高收率(> 96%)催化N-羟基-N-苯基丙烯酰胺与环戊二烯的[4 + 2]环加成反应,并且具有相当好的对映选择性(91%ee)。产物向相应的醇或醛的容易转化使得异羟肟酸中间体特别有用。