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
Enantioselective α-Vinylation of Aldehydes via the Synergistic Combination of Copper and Amine Catalysis
作者:Eduardas Skucas、David W. C. MacMillan
DOI:10.1021/ja303116v
日期:2012.6.6
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.
Nickel(0)-Catalyzed Asymmetric Hydrocyanation of 1,3-Dienes
作者:Biswajit Saha、T. V. RajanBabu
DOI:10.1021/ol062002f
日期:2006.9.1
1,2-Bis-diarylphosphinites are excellent ligands for the Ni(0)-catalyzed hydrocyanation of certain types of 1,3-dienes. 1-Phenyl-1,3-butadiene,1-vinyl-3,4-dihydronaphthalene, and 1-vinylindene undergo highly regioselective hydrocyanation under ambient conditions to give exclusively the 1,2-adducts in good to excellent yields. Using bis-1,2-diarylphosphinites derived from D-glucose, the highest enantioselectivities to-date for asymmetric hydrocyanation of 1,3-dienes (70-83% ee's) have been obtained.
Optically active allylsilanes. 1. Preparation by palladium-catalyzed asymmetric Grignard cross-coupling and anti stereochemistry in electrophilic substitution reactions