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Communication | Regular issue | Vol 36, No. 1, 1993, pp.29-32
Published online, 1st January, 1970
DOI: 10.3987/COM-92-6185
■ Directed Lithiation of 1-Triisopropylsilylgramine. A Short Access to 3,4-Disubstituted Indoles

Masatomo Iwao

*Department of Chemistry, Faculty of Liberal Arts, Nagasaki University, 1-14, Bunkyo-machi, Nagasaki 852-8521, Japan

Abstract

1-Triisopropylsilylgramine was lithiated regioselectively at C-4 by treatment with t-BuLi in ether at 0 °C for 1 h. The lithiated species was trapped with a variety of electrophiles to furnish 4-functionalized gramine derivatives in good yields. Replacement of the triisopropylsilyl protecting group by a methyl group resulted in C-2 selective lithiation under the similar reaction conditions.