Transition metal-free coupling reactions of benzylic trimethylammonium salts with di(hetero)aryl disulfides and diselenides
Fuhai Li, Dan Wang, Hongyi Chen, Ze He, Lihong Zhou, Qingle Zeng
Abstract
A new protocol was developed to synthesize (enantioenriched) thioethers and selenoethers from (chiral) benzylic trimethylammonium salts and di(hetero)aryl disulfides or diselenides. These syntheses were promoted by the presence of weak base and did not require the use of any transition metal, and resulted in the target products with good to excellent yields (72-94%). Using quaternary ammonium salts synthesized from enantiomerically enriched amines led to highly enantiopure benzylic thioethers and selenoethers (94-99% ee) with configurations reversed from those of their enantioenriched quaternary ammonium salts.
Topics & Concepts
Enantiopure drugArylChemistryAmmoniumTransition metalBase (topology)MetalCombinatorial chemistryOrganic chemistryEnantioselective synthesisCatalysisAlkylMathematical analysisMathematicsSulfur-Based Synthesis TechniquesCatalytic C–H Functionalization MethodsOrganoselenium and organotellurium chemistry