2-(Dialkoxyphosphinothioyl)thio-1,3,2-dioxoborolanes and -borinanes

摘要

2-(Dialkoxy-or alkylenedioxyphosphinothioyl) thio-1,3,2-dioxaborninanes have been prepared by refluxing ammonium O,O-dialkyl or O,O-alkylene phosphoroditioates with 2-chloro-1,3,2-dioxaborinanes in benzene [1]. We have developed a more convenient synthesis of cyclic boron-containing derivatives of phosphorodithioic acid by reaction of easily available 2-hydroxy-1,3,2-dioxaborolanes and -borinanes with phosphorodithioic acids. It was found that the reaction of O,O-dialkyl hydrogen phosphorodithioates Ia and Ib with 2-hydroxy-4,5-dimethyl-1,3,2-dioxaborolane (IIa) and 2-hydroxy-1,3,2-dioxaborinane (IIb) proceeds under ultrasonic irradiation for 5-15 min at 100-140 deg C to give 2-(diethoxyphosphinothioyl) thio-4,5-dimethyl-1,3,2-dioxaborolane (IIIa) and 2-(dialkoxyphosphinothioyl) thio-1,3,2-dioxaborinanes IIIb and IIIc.