Concerning kinetic resolution by the Sharpless asymmetric dihydroxylation reaction
作者:Hamish S. Christie、David P. G. Hamon、Kellie L. Tuck
DOI:10.1039/a906423k
日期:——
The transition state for the product-determining step in the Sharpless asymmetric dihydroxlation reaction is not product-like, and effective kinetic resolution can occur when one face of a chiral alkene is hindered.
Substituent effects on the stereoselectivity of the acid-catalyzed solvolysis of rigid 1-arylcyclohexene oxides. Further evidence for a mechanism implying different benzylic carbocationic species
An investigative study of kinetic resolutions by the Sharpless asymmetric dihydroxylation reaction
作者:David P.G Hamon、Kellie L Tuck、Hamish S Christie
DOI:10.1016/s0040-4020(01)00948-6
日期:2001.11
The requirements for a highly selective kinetic resolution with the Sharpless asymmetric dihydroxylation (AD) reaction were investigated with a number of alkene substrates. It was found that with 1-phenyl-4-tert-butylcyclohexene enantioselectivity is very high, yet diastereoselectivity is poor and kinetic resolution is ineffective. With 5-methyl-2-phenylbicyclo[3.2.0]heptan-2-ene both diastereoselectivity and enantioselectivity are high and kinetic resolution is effective. It was discovered that the transition state for the product-determining step in the Sharpless AD reaction is not product-like, and effective kinetic resolution can occur when one face of a chiral alkene is hindered. (C) 2001 Elsevier Science Ltd. All rights reserved.