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Note | Regular issue | Vol 81, No. 5, 2010, pp.1253-1259
Published online, 8th March, 2010
DOI: 10.3987/COM-10-11914
Synthesis of 4-Alkylidene-2-(dimethylamino)methyl-4H-3,1-benzoxazines by the Reaction of Alkyl 2-Isocyanophenyl Ketones with Eschenmoser’s Salt

Kazuhiro Kobayashi,* Yuta Okamura, Shuhei Fukamachi, and Hisatoshi Konishi

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

Abstract

4-Alkylidene-2-(dimethylamino)methyl-4H-3,1-benzoxazines could be prepared in one-pot by simply treating alkyl 2-isocyanophenyl ketones with dimethyl(methylene)ammonium iodide (Eschenmoser’s salt) in dichloromethane at 0 ˚C without any catalysts.