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
Bismuth trichloride as a new efficient catalyst in the aldol reaction
作者:Hidenori Ohki、Makoto Wada、Kin-ya Akiba
DOI:10.1016/s0040-4039(00)80590-0
日期:——
In the presence of a catalytic amount of bismuthtrichloride (5 mol%), silyl enol ethers react with aldehydes at room temperature to give the corresponding aldols in good yields.
Organolanthanide catalysis of a Mukaiyama addition reaction
作者:Leyi Gong、Andrew Streitwieser
DOI:10.1021/jo00313a002
日期:1990.12
Bis[bis(1,3-trimethylsilyl)cyclopentadienyl]-ytterbium(III) chloride, Cp''2YbCl, 2, is an effective catalyst in the presence of additional trimethylsilyl chloride for the reaction of silyl ester enolates, such as the trimethylsilyl enolate of methyl isobutyrate, 1, with aliphatic and aromatic aldehydes, to yield beta-silyloxy esters. The reaction shows good diastereoselection that is readily rationalized with a cyclic transition-state mechanism in which a key feature is the important role played by restricted coordination space around the lanthanide cation.
WADA, MAKOTO;TAKEICHI, EIJI;MATSUMOTO, TAKASHI, BULL. CHEM. SOC. JAP., 64,(1991) N, C. 990-994
作者:WADA, MAKOTO、TAKEICHI, EIJI、MATSUMOTO, TAKASHI
DOI:——
日期:——
OHKI, HIDENORI;WADA, MAKOTO;AKIBA, KIN-YA, TETRAHEDRON LETT., 29,(1988) N 37, C. 4719-4722