3, 4??Dihydro??benz [1, 3] oxazine Derivatives from 2??Acyl (or aroyl)??cyanatobenzenes

K Buttke, M Ramm, HJ Niclas

Index: Buttke, K.; Ramm, M.; Niclas, H.-J. Journal fuer Praktische Chemie/Chemiker-Zeitung, 1993 , vol. 335, # 6 p. 544 - 548

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Abstract

Abstract 3, 4-Dihydro-2H-benz [1, 3] oxazin-2-ones 3 are obtained from 2-acyl (or aroyl)- cyanatobenzenes 2 and anisole. The reaction proceeds under Friedel-Crafts conditions via DIMROTH rearrangement. Compounds 2, dissolved in diethyl ether, react with 1 in the presence of finely powdered KOH at ambient temperature leading to 8. The structure of 8b is confirmed by X-ray structure analysis.(Z)-4-Ethylidene-3, 4-dihydro-2H-benz [1, 3] oxazin- ...