A New Horner−Wadsworth−Emmons Type Coupling Reaction between Nonstabilized β-Hydroxy Phosphonates and Aldehydes or Ketones
作者:John F. Reichwein、Brian L. Pagenkopf
DOI:10.1021/ja027658s
日期:2003.2.19
acid mono methyl esters with diisopropyl carbodiimide at ambient temperature leads to clean stereospecific elimination. The phosphonic acid mono alkyl esters are accessible by the selective partial saponification of dimethyl or diethyl alkyl phosphonates with NaOH or MgBr(2). Isolated yields over both hydrolysis and elimination steps average 55-75%.
在环境温度下用二异丙基碳二亚胺处理不稳定的 β-羟基膦酸单甲酯会导致立体定向消除。膦酸单烷基酯可通过二甲基或二乙基烷基膦酸酯与 NaOH 或 MgBr(2) 的选择性部分皂化而获得。水解和消除步骤的分离产率平均为 55-75%。