Direct S-difluoromethylation of thiols using the Ruppert–Prakash reagent
摘要:
Direct S-difluoromethylation of aryl and aliphatic thiols using the Ruppert-Prakash reagent is demonstrated. The reaction produces trimethylsilyldifluoromethyl sulfides, which upon cleavage with fluoride produces the difluoromethyl sulfides. The key reaction features are the use of relatively inexpensive and commercially available starting materials, shorter reaction times, ambient temperatures, easy reaction procedure, and selective S-difluoromethylation in the presence of-OH, -NH2 and -CO2H functional groups. Furthermore, one-pot arylthiodifluoromethyl transfer to PhCHO is also demonstrated. (C) 2015 Elsevier B.V. All rights reserved.
Synthesis of Difluoromethyl Thioethers from Difluoromethyl Trimethylsilane and Organothiocyanates Generated In Situ
作者:Bilguun Bayarmagnai、Christian Matheis、Kévin Jouvin、Lukas J. Goossen
DOI:10.1002/anie.201500899
日期:2015.5.4
A copper‐CF2H complex generated in situfrom copper thiocyanate and TMSCF2H smoothly converts organothiocyanates into valuable difluoromethylthioethers. This reaction step can be combined with several thiocyanation methods to one‐pot protocols, allowing late‐stage difluoromethylthiolations of widely available alkyl halides and arenediazonium salts. This strategy enables the introduction of difluoromethylthio