Chiral NCN Pincer Rhodium(III) Complexes with Bis(imidazolinyl)phenyl Ligands: Synthesis and Enantioselective Catalytic Alkynylation of Trifluoropyruvates with Terminal Alkynes
作者:Tao Wang、Jun-Long Niu、Shuang-Liang Liu、Juan-Juan Huang、Jun-Fang Gong、Mao-Ping Song
DOI:10.1002/adsc.201200967
日期:2013.3.25
NCN pincer rhodium(III) complexes with bis(imidazolinyl)phenyl ligands have been conveniently synthesized from easily available materials. The complexes were subsequently applied in the enantioselective addition of terminal alkynes to trifluoropyruvates. With catalyst loading of 1.5–3.0 mol%, the alkynylation of ethyl or methyl trifluoropyruvate with a variety of electronically and structurally diverse
Thinking outside the box: A newly developed C1‐symmetric Rh/Phebox complex efficiently catalyzed the asymmetricalkynylation of α‐ketoester 1 with various aryl and alkyl substituted terminal alkynes to provide the corresponding chiral tertiary propargylic alcohols with up to 99 % ee (see scheme; TMS=trimethylsilyl).