Enantioselective alkylative double ring-opening of epoxides derived from cyclic allylic ethers: synthesis of enantioenriched unsaturated diolsElectronic supplementary information (ESI) available: the preparation and characterisation of derivatives for ee determinations. See http://www.rsc.org/suppdata/ob/b2/b212404a/
作者:David M. Hodgson、Matthew A. H. Stent、Bogdan Štefane、Francis X. Wilson
DOI:10.1039/b212404a
日期:2003.3.27
enantioselective organolithium-induced alkylative double ring-opening of 3,4-epoxytetrahydrofuran 1 with n-BuLi to give 3-methyleneheptane-1,2-diol 3 in 75% yield and 55% ee in the presence of bisoxazoline 10, and in up to 60% ee in the presence of (-)-sparteine 2. Extending the alkylative double ring-openingreaction to epoxidesderivedfrom oxabicyclo[n.2.1]alkenes (n = 2.3) results in the formation