Asymmetric cyclopropanation with diazoacetates induced by carbohydrate-derived chiral auxiliaries
摘要:
alpha-Diazoacetates with carbohydrate-based chiral auxiliaries have been synthesized and screened in the asymmetric cyclopropanation of styrene in connection with the effect of the chiral Cu(I)-catalyzed reaction, showing the remarkable importance of the carbohydrate-based chiral auxiliaries on the enantioselectivities and an unexpected effect on the trans:cis ratios. (C) 2007 Elsevier Ltd. All rights reserved.
DOI:
10.1016/j.tetasy.2007.04.027
作为产物:
描述:
果糖二丙酮 、 乙酰乙酸甲酯 反应 18.0h,
以92%的产率得到acetylacetate de di-O-isopropylidene-2,3:4,5 β-D fructopyranose
参考文献:
名称:
Zehani, Sadek; Llauro, Marie-France; Gelbard, Georges, Bulletin de la Societe Chimique de France, 1989, # 1, p. 104 - 113
Natural clays as efficient catalyst for transesterification of β-keto esters with carbohydrate derivatives
作者:Fernando C. da Silva、Vitor F. Ferreira、Renata S. Rianelli、Wilma C. Perreira
DOI:10.1016/s0040-4039(01)02388-7
日期:2002.2
Smectite, atapulgite and vermiculite clays catalyzed efficientlytransesterifications of β-ketoesters and carbohydrate derivatives in good to high yields without decomposition of the carbohydrate moieties.
Mild Diazo Transfer Reaction Catalyzed by Modified Clays
作者:Renata de S. Rianelli、Maria Cecília B. V. de Souza、Vitor F. Ferreira
DOI:10.1081/scc-120028368
日期:2004.12.31
A very mild method for the preparation of various 2-diazo-1,3-carbonyl compounds in the presence of environmentally attractive solid acids such as clays in a heterogeneous manner in moderate to good yield is reported.
ZEHANI, SADEK;LLAURO, MARIE-FRANCE;GELBARD, GEORGES, BULL. SOC. CHIM. FR.,(1989) N, C. 104-113
作者:ZEHANI, SADEK、LLAURO, MARIE-FRANCE、GELBARD, GEORGES
DOI:——
日期:——
Zehani, Sadek; Llauro, Marie-France; Gelbard, Georges, Bulletin de la Societe Chimique de France, 1989, # 1, p. 104 - 113
作者:Zehani, Sadek、Llauro, Marie-France、Gelbard, Georges
DOI:——
日期:——
Asymmetric cyclopropanation with diazoacetates induced by carbohydrate-derived chiral auxiliaries
作者:Vitor F. Ferreira、Raquel A.C. Leão、Fernando de C. da Silva、Sergio Pinheiro、Paul Lhoste、Denis Sinou
DOI:10.1016/j.tetasy.2007.04.027
日期:2007.6
alpha-Diazoacetates with carbohydrate-based chiral auxiliaries have been synthesized and screened in the asymmetric cyclopropanation of styrene in connection with the effect of the chiral Cu(I)-catalyzed reaction, showing the remarkable importance of the carbohydrate-based chiral auxiliaries on the enantioselectivities and an unexpected effect on the trans:cis ratios. (C) 2007 Elsevier Ltd. All rights reserved.