Preparation of 4-substituted-2-buten-4-olides from mucohalic acids
申请人:Angell Paul
公开号:US20060004211A1
公开(公告)日:2006-01-05
Methods and materials for preparing 4-substituted-2-buten-4-olides are disclosed. The method includes reacting a mucohalic acid with a silyl enol ether or a ketene silyl acetal in the presence of a Lewis acid.
Base-catalysed asymmetric hydroamination/cyclisation of aminoalkenes utilising a dimeric chiral diamidobinaphthyl dilithium salt
作者:Patricia Horrillo Martínez、Kai C. Hultzsch、Frank Hampel
DOI:10.1039/b518360j
日期:——
A dimeric proline derived diamidobinaphthyl dilithium salt represents the first example of a chiral main group metal based catalyst for asymmetric hydroamination/cyclisation reactions of aminoalkenes.
The asymmetric methylation of the N-benzylidene-DL-phenylalanine methyl ester was carried out in the presence of lithium salts of secondary amines derived from (S)-proline. The lithium amides of poly(imino-1-isobutylethylene) and its corresponding low-molecular-weight model compound, derived from (S)-leucine, were similarly used in order to examine the polymer effects with regard to the stereoselectivity
Provided are: eushearilides; a method for producing eushearilides; a production intermediate; and a pharmaceutical composition containing eushearilides. By having the Wittig reaction process, Mukaiyama Aldol reaction process and Macrolactonizaion process serve as key processes, eushearilides represented by formula (I) are efficiently produced.