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Synthesis 2013; 45(5): 601-608
DOI: 10.1055/s-0032-1318200
DOI: 10.1055/s-0032-1318200
paper
Enantioselective Synthesis of Highly Substituted Chromans by a Zinc(II)-Catalyzed Tandem Friedel–Crafts Alkylation/Michael Addition Reaction
Further Information
Publication History
Received: 12 December 2012
Accepted after revision: 20 January 2013
Publication Date:
05 February 2013 (online)


Abstract
An enantioselective tandem Friedel–Crafts alkylation/ Michael addition reaction of 1-methylindoles with nitroolefin enoates catalyzed by a chiral tridentate bisoxazoline-Zn(II) complex has been described. This method provides an efficient route to highly substituted chromans in good isolated yields with high stereoselectivities (up to 95:5 dr and 91% ee).
Key words
tandem reaction - Friedel–Crafts alkylation - 1-methylindole - chroman - nitroolefin enoateSupporting Information
- for this article is available online at http://www.thieme-connect.com/ejournals/toc/synthesis.
- Supporting Information