Catalytic asymmetric conjugate boration of α,β-unsaturated sulfones
作者:Abraham L. Moure、Ramón Gómez Arrayás、Juan C. Carretero
DOI:10.1039/c1cc11949d
日期:——
The alpha,beta-unsaturated sulfones are suitable activatedolefins in catalytic asymmetric conjugate beta-boration. These substrates undergo smooth conjugate addition of bis(pinacolato)diboron [B(2)(pin)(2)] catalyzed by nonracemic Cu(I)-diphosphine complexes to provide, upon subsequent oxidation, beta-hydroxy sulfones in good yields and high enantiocontrol.
Catalytic Asymmetric Conjugate Addition of Grignard Reagents to α,β-Unsaturated Sulfones
作者:Pieter H. Bos、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol801566n
日期:2008.10.2
A highly efficient method is reported for the asymmetric conjugate addition of Grignard reagents to alpha,beta-unsaturated 2-pyridylsulfones. Using a Cu/TolBinap complex, excellent enantioselectivities and high yields are obtained for a wide variety of aliphatic substrates.