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Obituary
Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Report | Regular issue | Vol 6, No. 8, 1977, pp.1181-1182
Published online, 1st January, 1970■ A Novel, Mild Preparation of thew 2H-1-Benzopyran-2-one (Coumarin) Ring System
Published online, 1st January, 1970
DOI: 10.3987/R-1977-08-1181
■ A Novel, Mild Preparation of thew 2H-1-Benzopyran-2-one (Coumarin) Ring System
Seppo I. Pennanen*
*Laboratory of Organic Chemistry, Helsinki University of Technology, P.O. Box 6100,FIN-02015 HUT, Espoo, Finland
Abstract
A facile synthesis of coumarins from o-hydroxycarbonyl compounds and 1-diethylaminopropyne is described. The reaction takes place under very mild conditions, giving coumarins in 38-47% yield. The unwanted sideproducts, the (E)-isomers, produced more coumarins after treatment the reaction mixture with acid, thus bringing the overall yields to 68-84%.
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