Enantioselective α-Vinylation of Aldehydes via the Synergistic Combination of Copper and Amine Catalysis
摘要:
The enantioselective alpha-vinylation of aldehydes using vinyl iodonium triflate salts has been accomplished via the synergistic combination of copper and chiral amine catalysis. These mild catalytic conditions provide a direct route for the enantioselective construction of enolizable alpha-formyl vinylic stereocenters without racemization or olefin transposition. These high-value coupling adducts are readily converted into a variety of useful olefin synthons.
Enantioselective Organo-SOMO Catalysis: The α-Vinylation of Aldehydes
作者:Hahn Kim、David W. C. MacMillan
DOI:10.1021/ja077212h
日期:2008.1.1
enantioenriched α-vinyl aldehydes. The described reaction procedure achieves carbon−carbonbondformation in an efficient manner with consistently high levels of enantioinduction and geometrical control for the trans-olefin product. A wide range of both aldehydes and potassium organotrifluoroborate salts, including those typically susceptible to oxidative conditions, are accommodated under the reaction conditions