化学学报 ›› 1983, Vol. 41 ›› Issue (6): 541-550. 上一篇    下一篇

研究论文

有机磷化合物的研究IX.某些具有活泼亚甲基化合物的碳磷酰化反应

袁承业;丁贻祥;龙海燕;李树森   

  1. 中国科学院上海有机化学研究所
  • 发布日期:1983-06-15

Studies on organophosphorous compounds ix. c-phosphorylation of compounds with an active methylene group

YUAN CHENGYE;DING YIXIANG;LONG HAIYAN;LI SHUSEN   

  • Published:1983-06-15

关键词: 氧化, 甲叉, 膦酸酯类, 磷酰化合物, 阴离子, 烯醇, 磷酸化作用, 阴碳离子, 苯乙腈 P

The formation of P -- C bond is one of the important problems in synthetic organophosphorous chemistry. This paper describes the study of the formation of P -- C linkage via phosphorylation of carbon atom containing active hydrogen. p-Substituted phenylacetonitrile possessing an active methylene group undergoes stepwise C -- phosphorylation smoothly with diethyl phosphoryl chloride in the presence of naphthalene-sodium. Phosphonyl chloride reacts analogously. Being a deprotonizing agent naphthalene-sodium is distinguished by its availability, effectiveness and mild reaction conditions. The presence of an electron-withdrawing group in the benzene ring reduces the yield of phosphorylation seriously. The chemical shift of ^3^1P NMR of the resulted α-cyano-benzylphosphonates (1) correlates linearly with the Hammett \s\ constants of the substituents. As indicated by ^1H NMR studies the protons in the ester ethyl groups are magnetically nonequivalent. Compound 1 can be alkylated with alkyl halide or condensed with aromatic aldehyde by Hornor-Wittig type reaction due to the presence of active hydrogen atom. The structure-reactivity studies of diethyl phosphoryl chloride on reacting with various β- and β-diketones and β-keto esters (5) as regiospecific reaction were reported. The influences of metal ions in the enolates on the reactivity of the latter were examined and discussed. Only vinyl phosphates with predominantly Z configuration have been isolated exclusively. The C atom with an active hydrogen in the β-diketones investigated is inert to phosphorylation. These experimental results are well supported by reaction selectivity in terms of Eqo/Ecoc based on EHMO calculation.

Key words: OXIDATION, METHYLENE, PHOSPHONIC ACID ESTER, PHOSPHORYL COMPOUNDS, ANION, ENOLS, PHOSPHORYLATION, CARBANION, BENZENEACETONITRILE P

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