Thiourea-catalysed conjugate additions of amines to vinyl phosphonates and phosphinates
作者:Peter E. McDermott、Martin P. Ó. Fearraigh、Alexandra M. Horan、Eoghan M. McGarrigle
DOI:10.1039/d2ob02116a
日期:——
Thiourea catalysts activated α,β-unsaturated phosphonates and phosphinates toward conjugate addition by amines to give β-aminophosphonates and β-aminophosphinates. The organocatalytic methodology was used to synthesise 15 β-aminophosphonates and -phosphinates in yields up to 99%. A gram-scale example furnished the corresponding β-aminophosphonate in an isolated yield of 99% with 97% catalyst recovery
硫脲催化剂活化 α,β-不饱和膦酸盐和次膦酸盐,通过胺进行共轭加成,得到 β-氨基膦酸盐和 β-氨基次膦酸盐。有机催化方法用于合成 15 β-氨基膦酸盐和 - 亚膦酸盐,产率高达 99%。一个克级的例子以 99% 的分离产率和 97% 的催化剂回收率提供了相应的 β-氨基膦酸酯。基于机械实验,磷酰氧和硫脲之间的氢键被认为在底物活化中起着至关重要的作用。