Asymmetric synthesis of 2H-aziridine phosphonates, and α- or β-aminophosphonates from enantiomerically enriched 2H-azirines
作者:Francisco Palacios、Domitila Aparicio、Ana Marı́a Ochoa de Retana、Jesús M. de los Santos、José I. Gil、Rafael López de Munain
DOI:10.1016/s0957-4166(03)00089-2
日期:2003.3
method for asymmetric synthesis of 2H-azirine-2-phosphonates 6 is described. The key step is a base-mediated Neber reaction of p-toluenesulfonyloximes 4 derived from phosphonates. Triethylamine 5, alkaloids 7 and solid-phase bound achiral 8 or chiral amines 9 are used. Reduction of 2H-azirines 6 with sodium borohydride in ethanol gives cis-aziridine-phosphonates 10. Ring opening of aziridines 10 and 11
描述了一种不对称合成2 H -azirine-2-膦酸酯6的简单有效的方法。关键步骤是衍生自膦酸酯的对甲苯磺酰氧肟4的碱介导的Neber反应。使用三乙胺5,生物碱7和固相键合的非手性8或手性胺9。在乙醇中用硼氢化钠还原2 H -azirines 6得到顺式-氮丙啶膦酸酯10。氮丙啶10和11的开环导致对映体富集的β-12和14以及α-氨基膦酸酯13和15。