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Note | Regular issue | Vol 81, No. 10, 2010, pp.2361-2368
Published online, 17th August, 2010
DOI: 10.3987/COM-10-12021
Synthesis of Isochromans by Hydriodic Acid or Iodine Mediated Cyclization Reactions of 1-(2-Vinylphenyl)propan-2-ols

Kazuhiro Kobayashi,* Kazuaki Shikata, Hiroki Maegawa, Shuhei Fukamachi, Miyuki Tanmatsu, and Hisatoshi Konishi

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

Abstract

Treatment of 1-(2-vinylphenyl)propan-2-ols, which can be easily prepared from 2-bromostyrenes and epoxides, with hydriodic acid in acetonitrile yields the corresponding isochromans (1H-3,4-dihydro-2-benzopyrans). When the above alcohols are treated with iodine in acetonitrile in the presence of sodium hydrogencarbonate, the corresponding 1-iodomethylisochromans are obtained, which can be easily converted into the corresponding 1-alkyl(or aryl)sulfanylmethylisochromans on treatment with sodium thiolates in DMF.