A careful interplay between the π electrophilicity of a cationic AuI center and the basicity of the corresponding counterion allowed for the chemo‐ and regioselective inter‐ as well as intramolecular de‐aromatization of 2,3‐disubstituted indoles with allenamides. The silver‐free bifunctional Lewis acid/Brønsted base complex [2,4‐(tBu)2C6H3O}3PAuTFA] assisted the formation of a range of densely functionalized
阳离子Au I中心的π亲电性和相应抗衡离子的碱性之间存在仔细的相互作用,从而可以利用烯丙酰胺对2,3-二取代的吲哚进行化学和区域选择性相互作用以及分子内脱芳香化作用。无银双官能路易斯酸/布朗斯台德碱络合物[2,4-(t Bu)2 C 6 H 3 O} 3 PAuTFA]在温和条件下协助形成了一系列密集官能化的吲哚胺。
First Example of C-3 Alkylation
of Indoles with Activated Azetidines Catalyzed by Indium(III)
Bromide
作者:J. Yadav、B. Reddy、G. Narasimhulu、G. Satheesh
DOI:10.1055/s-0028-1087957
日期:——
Indoles undergo smooth alkylation with N-tosylazetidines in the presence of indium(III) bromide in dichloroethane under mild conditions to produce the corresponding C-3 substituted indole derivatives in good to high yields and with high selectivity. This is the first report on the alkylation of indoles with activated azetidines.
Rapid Access to Spirocyclized Indolenines via Palladium-Catalyzed Cascade Reactions of Tryptamine Derivatives and Propargyl Carbonate
作者:Thomas D. Montgomery、Antoinette E. Nibbs、Ye Zhu、Viresh H. Rawal
DOI:10.1021/ol501409a
日期:2014.7.3
We report the intermolecular palladium-catalyzedreaction of tert-butyl propargylcarbonate with tryptamine derivatives or other indole-containing bis-nucleophiles. The reaction proceeds under mild conditions and with low catalyst loadings to afford novel spiroindolenine products in good to high yields.