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
Reduction of Alkynyl α-Hydroxy Esters: Stereoselective α-Ketol Rearrangement
作者:Thomas Hameury、Véronique Bellosta、Jérôme Guillemont、Luc Van Hijfte、Janine Cossy
DOI:10.1002/ejoc.200901202
日期:2010.2
The α-ketol rearrangement of tertiary α-hydroxy esters induced by LiAlH 4 /acid treatment provides α-hydroxy ketones in good yields and high diastereoselectivity. A mechanism is proposed for this reaction as well as a model to explain the diastereoselectivity of the rearrangement.