A new Lewis acid, Zn (ODf) 2, was first prepared from commercially available 3, 3, 4, 4- tetrafluoro [1, 2] oxathietane 2, 2-dioxide in four steps with 56% yields and also was applied to catalyze highly enantioselective alkynylation of aldehydes in the presence of ligand (1S, 2S)-3-(tert-butyldimethylsilyloxyl)-2-N, N-dimethylamino-1-(p-nitrophenyl) propane-1-ol or ligand (−)-N-methylephedrine to afford the corresponding propargylic alcohols in high ...
