A highly efficient catalytic kinetic resolution of 2,3-epoxy 3-aryl ketones via asymmetric ring-opening with pyrazole derivatives has been achieved by using a chiral N,N′-dioxide–Sc(iii) complex as the catalyst.
Stereocontrolled ring-opening of some enantiomerically enriched epoxy ketones and epoxy alcohols using trimethylaluminium: synthesis of (S )-2-arylpropanoic acids
作者:Lydia Carde、D. Huw Davies、Stanley M. Roberts
DOI:10.1039/b000996m
日期:——
cleavage furnished (S)-2-phenylpropanoic acid 11. In a complementary sequence epoxy ketones (−)-6 and 25 were converted into (S)-2-phenylpropanoic acid and (S)-fenoprofen 5 respectively by reduction with zinc borohydride, reaction with trimethylaluminium and oxidative cleavage. Similarly epoxy ketones (−)-6, 21 and 28 were treated with methylmagnesiumiodide, trimethylaluminium and the resultant alcohols subjected