Trisulfur Radical Anion (S<sub>3</sub><sup>•–</sup>) Involved [1 + 2 + 2] and [1 + 3 + 1] Cycloaddition with Aromatic Alkynes: Synthesis of Tetraphenylthiophene and 2-Benzylidenetetrahydrothiophene Derivatives
作者:Jing-Hao Li、Qi Huang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02066
日期:2018.8.3
S3•–-mediated [1 + 2 + 2] and [1 + 3 + 1] cycloaddition reactions of aromatic alkynes to give tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives via two C–S bond formations are developed. These two protocols provide new, simple, and straightforward strategies to construct tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives under transition-metal-free conditions
Aldehyde to Ketone Homologation Enabled by Improved Access to Thioalkyl Phosphonium Salts
作者:Meghan Fragis、Jackson L. Deobald、Srinivas Dharavath、Jeffrey Scott、Jakob Magolan
DOI:10.1021/acs.orglett.1c01189
日期:2021.6.18
to competing redox chemistry with sulfoxides. Here we circumvent this problem to achieve a formal phosphine Pummerer reaction that offers thioalkyl phosphonium salts that, in turn, give rise to diverse vinyl sulfides via Wittig olefinations. Thirty vinyl sulfides are thus prepared from (alkylthioalkyl)triphenyl phosphonium salts and aldehydes. The hydrolysis of these vinyl sulfides offers an efficient
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.
Functionalized cyclic sulfides with four to six membered rings were synthesized by ring closure of the labile thiols which were formed in situ by the nickelcomplex catalyzed electroreduction of the thioacetates and thiosulfonates having suitably placed electrophilic olefins or acetylenes.