Selective Synthesis of cis-α,β-Unsaturated Sulfoxides and Sulfides by the Horner-Wittig Reaction with Bis(2,2,2-trifluoroethyl)phosphono Sulfoxides and Aromatic Aldehydes
cis-α,β-Unsaturated sulfoxides were predominantly formed in the Horner-Wittig reaction with bis(2,2,2-trifluoroethyl)phosphono sulfoxides and aromatic aldehydes, while the reaction of the corresponding sulfides showed trans- or lower cis-selectivity. The reduction of cis-α,β-unsaturated sulfoxides with tributylphosphine in carbon tetrachloride gave cis-vinyl sulfides with retention of stereochemistry.
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
A transition-metal-free protocol for the synthesis of non-terminal alkenylethers, alkenylsulfides, and N-vinylazoles fromarylaldehydes or diarylketones, DMSO and O, S, N-nucleophiles has been reported. In this protocol, 24 examples of non-terminal alkenylethers and 28 examples of non-terminal alkenylsulfides in 72–95% yields have been synthesized within 5 min. Moreover, 27 examples of non-terminal
Desulfonylation of α-Methylthio-α,β-unsaturated Sulfones. A New Route to One Carbon Homologation of Aromatic Aldehydes
作者:Xian Huang、Han-Zhong Zhang
DOI:10.1055/s-1989-27143
日期:——
α-Methylthio-α,β-unsaturated sulfones 3 prepared from aromatic aldehydes 1 and sulfone 2 react with sodium hydrogen telluride in ethanol to undergo reductive desulfonylation to give vinyl sulfides 4 with certain extent of stereospecificity. A new route to one carbon homologation of aromatic aldehydes 1 to 5 is achieved by hydrolysis of 4 with titanium tetrachloride.