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Communication | Regular issue | Vol 26, No. 1, 1987, pp.35-38
Published online, 1st January, 1970
DOI: 10.3987/R-1987-01-0035
■ Electrocyclization of 4-Azidocoumarins Leading to Benzopyrano[3,4-d]-1,2,3-triazol-4-ones

Keiichi Ito and Junko Hariya

*Hokkaido College of Pharmacy, 7-1 Katsuraoka-cho, Otaru 047-02, Japan

Abstract

4-Azidocoumarins 2 as the stable heteroaromatic azides possessing a vinyl azide structure suffered 1,5-dipolar electrocyclization induced by t-butoxide leading to the formation of benzopyrano[3,4-d]-l,2,3-triazol-4-ones 3.