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Paper | Regular issue | Vol 75, No. 1, 2008, pp.95-105
Published online, 20th September, 2007
DOI: 10.3987/COM-07-11186
Convenient Synthesis of 1,4-Dihydro-2H-3,1-benzoxazin-2-ones by Iodocyclization of t-Butyl 2-Vinylphenylcarbamate

Kazuhiro Kobayashi,* Shuhei Fukamachi, Daizo Nakamura, Osamu Morikawa, and Hisatoshi Konishi

*Department of Materials Science, Faculty of Engineering, Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan

Abstract

It has been found that t-butyl 2-vinylphenylcarbamate derivatives underwent iodocyclization on treatment with iodine in the presence of sodium hydrogencarbonate to afford 4-iodomethyl-1,4-dihydro-2H-3,1-benzoxazin-2-one derivatives in generally good yields. The reduction of these 4-iodomethyl derivatives with tributyltin hydride gave the corresponding 4-methyl derivatives in good yields.