Improved methods for converting phosphite or phosphonate esters into corresponding thiophosphites or thiophosphonates and for synthesizing specific thiophosphite and thiophosphonate compounds so produced are disclosed and claimed. The methods start from phosphite diesters using P.sub.4 S.sub.10 as the thionation reagent. The reaction mixture is refluxed until the reaction is complete and may be followed by separation and chloroformate ester phosphonation steps to produce pure thiophosphonocarboxylate triesters. Alternatively, these esters may be prepared directly by action of P.sub.4 S.sub.10 on the corresponding phosphonocarboxylate esters. The former method was used to prepare dimethyl thiophosphite and thence trimethyl thiophosphonoformate, a key intermediate in synthesis of salts of thiophosphonoformic acid, which have anti-viral properties.
改进的方法用于将
亚磷酸酯或
膦酸酯转化为相应的
硫代
亚磷酸酯或
硫代
膦酸酯,并用于合成所产生的特定
硫代
亚磷酸酯和
硫代
膦酸酯化合物。这些方法从
亚磷酸二酯出发,使用P.sub.4 S.sub.10作为
硫化试剂。反应混合物经过回流直至反应完成,然后可以进行分离和
氯甲酸酯
磷酸化步骤,以产生纯的
硫代
膦酸酯三酯。或者,这些酯可以直接通过P.sub.4 S.sub.10对应的
膦酸酯酯进行制备。前一种方法被用于制备
二甲基硫代
亚磷酸酯,然后是三
甲基硫代膦酸酯
甲酸酯,这是合成
硫代
膦酸盐的关键中间体,具有抗病毒特性。