Improved addition of organolithium reagents to hindered and/or enolisable ketones
作者:Vincent Lecomte、Elie Stéphan、Franck Le Bideau、Gérard Jaouen
DOI:10.1016/s0040-4020(03)00189-3
日期:2003.3
the addition of some aryl- and alkyllithium derivatives to somehindered and/or enolisable ketones in different solvents (polar and apolar) and, in some cases, at different temperatures and reaction times, will be presented here. The reversibility of the addition of aryllithium to these specific ketones will be observed and discussed. This approach is then used to prepare new steroids as precursor for
Cerium(III) chloride promoted addition of organometallic reagents to (−)-menthone—preparation of chiral neomenthyl derivatives †Dedicated to Professor Dr. Karl-Heinz Thiele on the occasion of his 70th birthday. †
作者:Stefan Panev、Vladimir Dimitrov
DOI:10.1016/s0957-4166(00)00087-2
日期:2000.4
The activation of (−)-menthone with anhydrous CeCl3 led to high yielding additions of different organometallic reagents. Products of exclusively equatorial-addition of the reagents were obtained; only PhMgBr yielded additionally ca. 5% of the axial-addition product.