The nano-Al2O3-promoted epoxidation of alkenes with molecular oxygen as the oxidant has been developed, providing an efficient route to a variety of epoxides in moderate to excellent yields. The environmentally friendly and efficient nano-Al2O3 catalyst could be easily recovered and reused five times without significant loss of activity.
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
Rearrangement of epoxidized benzyne/furan cycloadducts: a convenient route to α-formyl and α-acyl-2-indanones
作者:Larry G. French、Edward E. Fenlon、Timothy P. Charlton
DOI:10.1016/s0040-4039(00)92102-6
日期:1991.2
The Lewis acids, LiClO4 and BF3.Et2O, promote carbocation driven ring contracting rearrangements of epoxides derived from the Diels-Alder adducts of benzyne and furans. This unprecedented transformation provides moderate to excellent yields of novel alpha-formyl and alpha-acyl-2-indanones.
French, Larry G.; Charlton, Timothy P., Heterocycles, 1993, vol. 35, # 1, p. 305 - 313