期刊
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
卷 2011, 期 20-21, 页码 3700-3705出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.201100506
关键词
Alkylation; Nitrogen heterocycles; Organocatalysis; Bronsted acids; Nitroalkenes
资金
- Ministry of Science and Innovation (MICINN), Madrid, Spain [CTQ2010-19606]
- Government of Aragon, Zaragoza, Spain [PI064/09, E-10]
- CSIC
A novel study on the influence of external Bronsted acids on thiourea catalysts in the asymmetric Friedel-Crafts alkylation of indoles with nitroalkenes is reported. The final 3-substituted indole derivatives were synthesized with better results because of cooperative effects between the chiral thiourea and a Bronsted acid additive (1a center dot HA). The effects of diverse catalysts, different acid additives, solvents, and temperatures in the reaction were also explored. The high reactivity and selectivity of the reaction is presumptively attributed to an appropriate assembly between the Bronsted acid and the thiourea structure, affording a more acidic and rigid catalytic complex.
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