Desulfurization of epidithio-2,5-piperazinedione derivatives and their open chain analogs with triphenyl phosphine
作者:T. Sato、T. Hino
DOI:10.1016/0040-4020(76)80072-5
日期:——
an intermediate of the desulfurization. Similar cycloaddition products (13 and 14) were obtained by the desulfurization of 6c in the presence of benzofuran, indole or skatole. Desulfurization of open chain disulfides (16, 21, 23 and 25) by triphenylphosphine gave reduced products (17, 22 and 26) and an isoxazole (18), but CC bond formation was not observed.
在THF中用三苯基膦对表二硫-2,5-哌嗪二酮(6和7)进行脱硫,得到二聚化合物(8和15)。在水或苯酚存在下,脱硫得到3-羟基(9)或3-苯氧基-2,5-哌嗪二酮(10)。的反应图6c与三苯基膦在乙基乙烯基醚,得到2,5-二氮杂双环[2.2.2]辛烷-3,6-二酮(11),表明1,4-偶极(存在乙)作为中间体脱硫的。通过6c脱硫得到类似的环加成产物(13和14)。在苯并呋喃,吲哚或粪臭素的存在下。开链二硫化物(脱硫16,21,23和25)通过三苯基膦给出了降低产品(17,22和26)和一个异恶唑(18),但没有观察到CC键形成。