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■ Synthesis of 3,4-Dihydro-2H-1,3-benzoxazine-2-thiones via Cyclization of 2-(1-Isothiocyanatoalkyl)phenols

Kazuhiro Kobayashi,* Hiroki Inouchi, Naoki Matsumoto, and Yuuki Chikazawa

*Division of Applied Chemistry, Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan

Abstract

Convenient sequences for the preparation of 3,4-dihydro-2H-1,3-benzoxazine-2-thiones from 2-hydroxybenzaldehyde and 2-hydroxyphenyl ketones or 2-methylphenols have been developed, which both employ cyclization of 2-(1-isothiocyanatoalkyl)phenols generated in situ under mild conditions.