Crucial role of the ligand of silyl Lewis acid in the Mukaiyama aldol reactionElectronic supplementary information (ESI) available: experimental section. See http://www.rsc.org/suppdata/cc/b2/b203838b/
The Me3SiX-induced Mukaiyamaaldolreaction proceeds through each catalytic cycle under the influence of X-: the silyl group of Me3SiNTf2 does not release from -NTf2 and that of silyl enol ether intermolecularly transfers to the product, while the silyl group of Me3SiOTf remains in the product and that of the silyl enol ether becomes the catalyst for the next catalytic cycle.
TiCl 4 joue un role important dans le controle delastereoselectivitedela reaction Mukaiyama. L'acide de Lewis sert aussi bien de groupe dirigeant la stereochimie que d'activateur du groupe carbonyle. Une forte pression creee lastereoselectivite via un etat de transition bateau, tandis qu'une faible pression produit lastereoselectivite via un etat de transition chaise
TiCl 4 joue 对 Mukaiyama 立体选择性反应的重要控制作用。L'acide de Lewis sert aussi bien de groupe dirigeant lasterochimie que d'activateur du groupe carbonyle。Une forte pression creee lastereoselectivite via un etat de transition bateau, tandis qu'une faible pression produit lastereoselectivite via un etat de transition chaise
Bismuth Trichloride as a New Efficient Catalyst in the Aldol Reaction and the Michael Reaction
作者:Makoto Wada、Eiji Takeichi、Takashi Matsumoto
DOI:10.1246/bcsj.64.990
日期:1991.3
In the presence of a catalytic amount of bismuth(III) trichloride (5 mol%), silyl enol ethers react with aldehydes at room temperature in dichloromethane to give the corresponding aldols in good yields. Silyl enol ethers also have been found to react with α,β-unsaturated ketones at room temperature in dichloromethane to afford the corresponding 1,5-dicarbonyl compounds, the Michael adducts in good