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。
Easy and efficient synthesis of enantiomerically enriched 2H-azirines derived from phosphonates
摘要:
An efficient synthesis of 2H-azirines substituted with a phosphonate group is described. The key step is an alkaloid-mediated Neber reaction of beta-ketoxime tosylates. Reduction of 2H-azirines with sodium borohydride in ethanol gives 2-phosphorylated cis-aziridines. (C) 2000 Published by Elsevier Science Ltd.
Synthesis of Pyrazine-phosphonates and -Phosphine Oxides from 2<i>H</i>-Azirines or Oximes
作者:Francisco Palacios、Ana María Ochoa de Retana、José Ignacio Gil、Rafael López de Munain
DOI:10.1021/ol0261534
日期:2002.7.1
[reaction: see text] Tetrasubstituted pyrazines containing two phosphonate groups 2 in positions 2 and 5 and trisubstituted pyrazines containing a phosphonate 5 or a phosphine oxide group 7 in position 2 are obtained by thermal treatment of 2H-azirine-2-phosphonates 1 and -phosphine oxides 6. These pyrazines can also be prepared from beta-ketoxime tosylates 9 and 10 or from oxime derived from phosphine