Synthesis 2016; 48(01): 141-149
DOI: 10.1055/s-0035-1560501
paper
© Georg Thieme Verlag Stuttgart · New York

Synthesis of Allyl- and Prenylcoumarins via Microwave-Promoted Tandem Claisen Rearrangement/Wittig Olefination

Bernd Schmidt*
Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam-Golm, Germany   eMail: bernd.schmidt@uni-potsdam.de
,
Martin Riemer
Universitaet Potsdam, Institut fuer Chemie, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam-Golm, Germany   eMail: bernd.schmidt@uni-potsdam.de
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Publikationsverlauf

Received: 18. August 2015

Accepted after revision: 22. September 2015

Publikationsdatum:
20. Oktober 2015 (online)


Abstract

Allyl, dimethylallyl, crotyl, and prenyl ethers of various aromatic ortho-hydroxy carbonyl compounds undergo a tandem sequence of Claisen rearrangement, carbonyl olefination, and cyclization upon microwave irradiation in the presence of a stabilized ylide. The products are multiply substituted 6- or 8-allylated or prenylated coumarins (2H-chromen-2-ones).

Supporting Information