Abstract
An improved synthetic strategy for the in situ preparation of vinyl cuprated from alkynes is presented and used for the setreospecific synthesis of di-, tri-, and tetrasubstituted olefins. Hydroalumination or Cp 2 ZrCl 2 -catalyzed carboalumination of alkylines, followed by in situ transmeralation to bis-alkynyl-cooper complex (C 4 H 9 C≡C) 2 CuCNLi 2 and addition of enones, led to the isolation of 1,4-addition products in high yields
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