Carbocupration/Zinc Carbenoid Homologation and β-Elimination Reactions for a New Synthesis of Allenes − Application to the Enantioselective Synthesis of Chiral Allenes by Deracemization of sp3-Organometallic Derivatives
作者:Jos P. Varghese、Irena Zouev、Lionel Aufauvre、Paul Knochel、Ilan Marek
straightforward carbocupration/zinc homologation/β-elimination reaction sequence allows the one-pot synthesis of polysubstituted allenes from acetylenic sulfoxides in excellent isolated chemical yields. Secondary zinccarbenoids were used for the homologation reaction, and so a new synthesis of 1,1-diiodoalkanes is described. This methodology also allows the synthesis of chiral allenes through thermodynamic
A CONVENIENT METHOD FOR THE PREPARATION OF ALLENES FROM PROPARGYL ALCOHOLS USING 1-ETHYL-2-FLUORO-4,6-DIMETHYLPYRIDINIUM TETRAFLUOROBORATE
作者:Teruaki Mukaiyama、Ken Kawata
DOI:10.1246/cl.1978.785
日期:1978.7.5
In the presence of a catalytic amount of copper(I) iodide, Grignard reagents reacted with 2-propargyloxypyridinium salts, formed in situ from propargyl alcohols and 1-ethyl-2-fluoro-4,6-dimethylpyridinium tetrafluoroborate, to produce various substituted allenes in good yields.
Synthesis and stereochemistry of allenes. Part 3. Highly stereoselective synthesis of chiral alkyl allenes by organocopper(I)-induced anti 1,3-substitution of chiral propynyl esters
作者:Cornelis J. Elsevier、Peter Vermeer
DOI:10.1021/jo00276a040
日期:1989.7
MUKAIYAMA TERUAKI; KAWATA KEN, CHEM. LETT., 1978, NO 7, 785-788