Reactions of Selenothioic Acid<i>S</i>-Esters and Diselenoic Acid Esters with Trialkyl Phosphites Leading to<i>α</i>-Phosphoryl Sulfides and Selenides
作者:Toshiaki Murai、Chiyoko Izumi、Shinzi Kato
DOI:10.1246/cl.1999.105
日期:1999.2
The reaction of selenothioic acid S-esters with trialkyl phosphites proceeded smoothly to afford α-phosphoryl sulfides as a major product in good to high yields. The reaction was also applicable to diselenoic acidesters. On the contrary, selenothioic acid S-butyl ester underwent oxidative dimerization with triphenylphosphine to give a divinyl diselenide.
Selenothioic acid S-alkyl esters were treated with Et3N and Cd(OAc)2·2H2O to give symmetrically substituted selenophenes, whereas the similar reaction in the presence of alkyl halides afforded ketene selenothioacetals in moderate yields.
smoothly with the extrusion of selenium atoms to afford α-phosphoryl sulfides 2 in good to high yields. A similar reaction takes place more easily with dimethyl phenylphosphonite and methyl diphenylphosphinite, although the ketene selenothioacetals 3 are also formed as by-products in increased yields. The use of diselenoic acid esters 1f and 1g gives α-phosphoryl selenides 2m and 2n. The products exhibit characteristic