Stereoselective synthesis of - and -1,2-diols from diketo sulfides via -3,4-dihydroxythiolanes
作者:Juzo Nakayama、Shoji Yamaoka、Masamatsu Hoshino
DOI:10.1016/s0040-4039(00)95425-x
日期:1987.1
Intramolecular reductive coupling reaction of a series of diketo sulfides () by a low-valent titanium reagent at 0 °C in tetrahydrofuran leads to -3,4-dihydroxythiolanes () exclusively in 67–89% yields. Desulfurization of by Raneynickel in ethanol affords either - or or -1,2-diols () in 51–82% yields.
General synthesis of 2,5-dihydrothiophenes (3-thiolenes) from diketo sulfides
作者:Juzo Nakayama、Haruki Machida、Masamatsu Hoshino
DOI:10.1016/s0040-4039(00)98357-6
日期:1985.1
The intramolecular reductive coupling reaction of easily accessible diketo sulfides by a low-valenttitaniumreagent [prepared fromtitanium(IV) chloride and zinc powder] provides an efficient general synthesis of 2,5-dihydrothiophenes.