Enantioselective Rearrangement of Proline Sulfonamides: An Easy Entry to Enantiomerically Pure α-Aryl Quaternary Prolines
作者:Francesca Foschi、Dario Landini、Vittoria Lupi、Voichiţa Mihali、Michele Penso、Tullio Pilati、Aaron Tagliabue
DOI:10.1002/chem.201000989
日期:2010.9.17
under basic conditions (see scheme), without any external source of stereochemical information. The sulfonamide aromatic ring must contain an electron‐withdrawing group (EWG), which stabilizes an intermediate Meisenheimer complex. The overall process provides easy entry to a series of optically pure α‐aromatic prolines.
通过在碱性条件下(见方案)对N-(芳基磺酰基)脯氨酸叔丁酯进行立体选择性重排,可以制备对映体纯的季脯氨酸,而没有任何外部立体化学信息来源。磺酰胺芳环必须包含一个吸电子基团(EWG),该基团可稳定中间体Meisenheimer配合物。整个过程可轻松进入一系列光学纯的α-芳族脯氨酸。