Chemistry of organosilicon compounds. 260. Allylation of .alpha.-hydroxy ketones with allyltrifluorosilanes and allyltrialkoxysilanes in the presence of triethylamine. Stereochemical regulation involving chelated bicyclic transition states
作者:Kazuhiko Sato、Mitsuo Kira、Hideki Sakurai
DOI:10.1021/ja00198a069
日期:1989.8
Diastereo- and enantio-selective crotylation of α-ketoesters using crotyl boronic acid ester complexes
作者:Yanping Chen、Laxman Eltepu、Paul Wentworth
DOI:10.1016/j.tetlet.2004.09.082
日期:2004.11
A diastereo- and enantio-selective crotylation of ethyl pyruvate has been achieved using a chiral boronic acid auxiliary-based approach. This reaction creates two contiguous stereogenic centers, one of which is a quaternary carbon with complete diastereoselectivity and with enantioselectivities up to 7:1 (73% ee). (C) 2004 Published by Elsevier Ltd.
Stereoselective allyl- and crotylboration of alpha-hydroxyketones via neighboring group control
作者:Zhe Wang、Xian-Jun Meng、George W. Kabalka
DOI:10.1016/0040-4039(91)85008-s
日期:1991.4
Allylboronates and crotylboronates react with alpha-hydroxyketones to yield tertiary homoallylic alcohols in a highly stereocontrolled manner. The reaction presumably proceeds via a rigid bicyclic transition state. The alpha-hydroxy substituent exerts a remarkable and predictable effect on the diastereoselectivity of the reaction. Homoallylic alcohols are formed with diastereoselectivities approaching 100%.