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Note | Regular issue | Vol 48, No. 12, 1998, pp.2611-2619
Published online, 1st January, 1970
DOI: 10.3987/COM-98-8294
A Facile Synthesis of Methyl 5-Amino-6-chloro-2H-1-benzopyran-8-carboxylate Derivatives

Takuji Kakigami,* Kunihisa Baba, and Toshinao Usui

*General Research Park, Sanwa Kagaku Kenkyusho Co., Ltd., 363, Shiosaki, Hokusei-cho, Inabe-gunn, Mie 511-0406, Japan

Abstract

Methyl 6-chloro-5-pivaloylamino-2H-1-benzopyran-8-carboxylate (4d) was prepared in good yield as a result of the thermal cyclization of methyl 5-chloro-4-pivaloylamino-2-propargyloxybenzoate (3d) using N,N-diethylaniline as a solvent.