Synthesis of New α-Hydroxy-, α-Halogeno- and Vinylphosphonates Derived from 5,5-Dimethyl-1,3,2-dioxaphosphinan-2-one
作者:Sudha Kumaraswamy、R. Senthamizh Selvi、K.C. Kumara Swamy
DOI:10.1055/s-1997-1166
日期:1997.2
Several α-hydroxyphosphonates have been prepared by the Pudovik reaction of the cyclic phosphite 5,5-dimethyl-1,3,2-dioxaphosphinan-2-one with aldehydes and β-oxo aldehydes. These can be readily converted to α-chloro- or α-bromophosphonates in excellent yield by simply treating them with thionyl chloride or bromide. Reaction with phosphorus triiodide gave α-iodophosphonates and α-hydridophosphonates. The Pudovik products are obtained from β-oxo aldehydes can be readily dehydrated to give vinylphosphonates.
通过环状亚磷酸酯 5,5-二甲基-1,3,2-二氧磷杂环-2-酮与醛和δ-氧代醛的普多维克反应,制备了几种δ-羟基膦酸盐。只需用亚硫酰氯或溴处理这些物质,就能很容易地将其转化为δ-氯或δ-溴膦酸盐,而且收率极高。与三碘化磷反应可得到δ-碘膦酸盐和δ-氢膦酸盐。从 δ-oxo 醛中得到的 Pudovik 产物很容易脱水,从而得到乙烯基膦酸盐。