C,C-coupling with sulfur-stabilized carbanions — 6. Preparation and electrophilic substitution of 1-[3-methyl-2-(2-thiolanylthio)-butyl]piperidine and dethioacetalization of semicyclic dithioacetals,
作者:C Birk
DOI:10.1016/0040-4020(96)00757-0
日期:1996.9.23
dithioacetals 12 – 15 are converted into the corresponding carbonyl compounds with [bis(trifluoroacetoxy)iodo]benzene (PIFA). Phenyl dichlorophosphate (PDCP) in the presence of sodium iodide and DMF is found to be a reagent for selective cleavage of the exocyclic CS bond. By using DOWEX 50W and paraformaldehyde in acetone/water a cleavage of both acetalic CS bonds is achieved in certain cases.