The reactivity of organophosphorus compounds. Part XXVII. Reactions of alkyl hydrogen alkylphosphonates with p-nitrobenzonitrile oxide: anchimerically assisted P–O fission in acidic hydrolysis of the resulting α-hydroxyimino-p-nitrobenzyl alkylphosphonates
作者:J. I. G. Cadogan、J. A. Challis、D. T. Eastlick
DOI:10.1039/j29710001988
日期:——
p-Nitrobenzonitrile oxide reacts readily with alkyl hydrogen alkylphosphonates (I; R1= Me, R2= Me, Et, Pr, Pri, ButCH2, or ButCHMe) and (I; R1= Et, But, or Ph; R2= Et), diethyl hydrogen phosphate, and hydrogen diethylphosphinate to give the corresponding 1:1-adducts, alkyl α-hydroxyimino-p-nitrobenzyl alkylphosphonates (II; R1= Me; R2= Me, Et, Pr, Pri, ButCH2, or ButCHMe) and (II; R1= Et, But or Ph;
p -Nitrobenzonitrile与烷基氢烷基膦容易氧化物反应(I; R 1 =我,R 2 =甲基,乙基,镨,镨我,卜吨CH 2,或卜吨CHME)和(I; R 1 =的Et,卜t或Ph; R 2 = Et),磷酸二乙基氢和二乙基次膦酸氢生成相应的1:1加合物,即烷基α-羟基亚氨基-对硝基苄基烷基膦酸酯(II; R 1 = Me; R 2 = Me,乙基,丙基,镨我,卜吨CH 2,或卜吨CHME)和(II; R 1=的Et,卜吨或pH; [R 2 = ET),二乙基α羟基亚p硝基苄酯(II; R 1 =环氧乙烷,R 2 = ET),和α羟基亚p分别硝基苄二乙基次膦酸(III)。除了在酸性条件下稳定的最后一种情况外,加合物在稀有的二恶烷水溶液中在pH 2-3·5的条件下,以非常快速的,通过手性辅助的方式发生了P–O裂变(动力学研究表明,其快约10 7,比在相似条件下经历烷基-氧裂变的简单