Synthesis of Enantiopure (S)-Indolylglycine by Organocatalyzed Friedel–Crafts Alkylation of Indole
作者:Martin J. Wanner、Peter Hauwert、Hans E. Schoemaker、René de Gelder、Jan H. van Maarseveen、Henk Hiemstra
DOI:10.1002/ejoc.200700886
日期:2008.1
Tritylsulfenyl- and 2-nitrophenylsulfenyl-substituted glyoxyl imines were used in chiral phosphoric acid catalyzed Friedel-Crafts (FC) reactions with indole. High yields and ee values ranging from 86% for Nps-protected (S)-indolylglycine to 88% for Trs-protected (R)-indolylglycine were obtained. On a preparative scale, a FC product with 99.5% ee and 71% yield was readily obtained by crystallization
Tritylsulfenyl-和2-nitrophenylsulfenyl-取代的乙醛亚胺用于手性磷酸催化的与吲哚的Friedel-Crafts (FC)反应。获得了高产率和 ee 值,范围从 Nps 保护的 (S)-吲哚甘氨酸的 86% 到 Trs 保护的 (R)-吲哚甘氨酸的 88%。在制备规模上,通过反应混合物的结晶很容易获得具有 99.5% ee 和 71% 产率的 FC 产品。在温和的酸性条件下去除 Nps 保护基不会影响 α-碳原子的立体化学完整性,并且以 >= 98% ee 提供 (S)-吲哚甘氨酸。
Amat-Guerri, Francisco; Martinez-Utrilla, Roberto; Pascual, Conrad, Journal of Chemical Research, Miniprint, 1984, # 5, p. 1578 - 1586
Bis-trimethylsilylacetamide: A reagent for the control of Friedel-Crafts alkylation reactions using methyl chloromethoxyacetate
作者:Martyn J. Earle、Robin A. Fairhurst、Harry Heaney
DOI:10.1016/0040-4039(91)80781-z
日期:1991.10
The Friedel-Crafts alkylation reactions of electron rich aromatic compounds using methyl alpha-chloro-alpha-methoxyacetate and Lewis acids leads predominantly to the formation of diarylacetic acid derivatives in which the second stage of the sequence is favoured by the presence of hydrogen chloride generated in the first step; effective control can be achieved in a number of cases by the addition of bis-trimethylsilylacetamide.
NEEF, G.;EDER, U.;HUTH, A.;RAHTZ, D.;SCHMIECHEN, R.;SEIDELMANN, D., HETEROCYCLES, 1983, 20, N 7, 1295-1313
作者:NEEF, G.、EDER, U.、HUTH, A.、RAHTZ, D.、SCHMIECHEN, R.、SEIDELMANN, D.