(2R,3R,5R)-2-Aryl-3,5-diphenyl-[1,4,2]-oxazaphosphinanes 6, analogues of C-arylmorpholinol 3, were prepared with diastereomeric excess higher than 94%, via a three step sequence: (i) diastereoselective addition-cyclization reaction from methyl hypophosphite and a chiral imine 10, (ii) pallado-catalyzed arylation, and then (iii) a selective inversion of configuration at the phosphorus center. (c) 2006 Elsevier Ltd. All rights reserved.
(2R,3R,5R)-2-芳基-3,5
-二苯基-[1,4,2]-氧化膦杂环 6 是C-芳基吗啉醇 3 的模拟物。通过以下三步工艺制备:(i) 甲基
次磷酸酯和手性
亚胺 10 的对映选择性加成-环化反应;(ii)
钯催化的芳基化反应;(iii) 选择性地在
磷中心翻转构型。该过程的对映体过量率高于94%。©2006 Elsevier Ltd. 保留所有权利。