Highly enantioselective Michael addition reactions in water catalyzed by an insoluble MPS-supported 4-sulfonamidyl prolinol tert-butyldiphenylsilyl ether
作者:Yongming Chuan、Guihua Chen、Yungui Peng
DOI:10.1016/j.tetlet.2009.04.011
日期:2009.6
The development of a highly efficient, insoluble, and non-swelling MPS-supported organocatalyst for the direct asymmetric Michael reaction of ketones and aldehydes to nitrostyrenes at room temperature in water is described. Excellent yields (up to 100%) and high stereoselectivities (up to 94% dr and 93% ee) were achieved with 10 mol % of the catalyst. The resin-bound catalyst was simply separated and
Provided is a process for producing an ester or alcohol using a fluoroimidinium sulfonate derivative represented by the general formula (9) or a fluoroimidinium carboxylate derivative represented by the general formula (6) and using as a raw material alcohol involving inversion of steric configuration. Further provided are a fluoroimidinium sulfonate derivative represented by the general formula (9), and a process for producing the same.