作者:Timothy J. Donohoe、Paul M. Guyo、Madeleine Helliwell
DOI:10.1016/s0040-4039(98)02395-8
日期:1999.1
pyrroles substituted with a chiral auxiliary at the C-2 position. Using either 8-phenylmenthol ortrans-2-(α-cumyl)cyclohexanol (TCC) as auxiliaries, high levels of stereoselectivity were obtained. Moreover, the auxiliary could be removed using a high-yielding three-step sequence to furnish substituted dehydroproline derivatives with high enantiomeric purity. By choosing either (−)-8-phenylmenthol or (+)-TCC
桦木还原法已应用于在C-2位置被手性助剂取代的缺电子的吡咯。使用8-苯基薄荷醇或反-2-(α-枯基)环己醇(TCC)作为助剂,可以获得高水平的立体选择性。此外,可以使用高产率的三步顺序除去助剂,以提供具有高对映体纯度的取代的脱氢脯氨酸衍生物。通过选择(-)-8-苯基薄荷醇或(+)-TCC作为辅助,可以获得脱氢脯氨酸产物的对映异构体。