Journal
ORGANIC LETTERS
Volume 9, Issue 5, Pages 891-894Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol070011y
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The scope and limitations of the conjugate addition of 2- and the first 4-pyridyl Gilman homocuprates to various alpha,beta-unsaturated Michael acceptors are delineated. The conjugate addition of the cuprate of 2-bromo-3-methylpyridine to (E)-methyl crotonate then diastereoselective enolate alkylation and lipase-mediated enantioselective ester hydrolysis have enabled an efficient four-step first asymmetric synthesis of the Celastraceae sesquiterpenoid esterifying ligand ( -)-(1'S,2'S)-evoninic acid.
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