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Report | Regular issue | Vol 23, No. 1, 1985, pp.165-170
Published online, 1st January, 1970
DOI: 10.3987/R-1985-01-0165
Selective Halogenation of 4-Oxo-4,5,6,7-tetrahydroindoles to 5-Halo-4,5,6,7-tetrahydeoindoles with Copper(II) Halides

Masakatsu Matsumoto,* Yasuko Ishoda, and Nobuko Watanabe

*Sagami Central Research Center, 4-4-1 Nishi-Ohnuma, Sagamihara, Kanagawa 229-0012, Japan

Abstract

Halogenation of 4-oxo-4,5,6,7-tetrahydroindoles with copper(II) bromide or copper(II) chloride gave selectively 5-halo-4-oxo-4,5,6,7-tetrahydroindoles, which were easily transformed to 4-hydroxyindoles by the action of lithium halide/lithium carbonate in dimethylformamide.