Cyclopropanecarboxylic acid, 1-[4-amino-3-[2-(trimethylsilyl)ethynyl]phenyl]-, methyl ester → HCID 59129295, compound

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Reaction Steps

To a degassed solution of methyl 1-(4-amino-3-((trimethylsilyl)ethynyl)phenyl)cyclopropanecarboxylate (4.69 g, 0.02 mol) in DMF (20 mL) was added CuI (1.5 g, 0.008 mol) under N2 at room temperature. The mixture was stirred for 3 hr at room temperature. The insoluble solid was filtered off and washed with EtOAc (50 mL×3). The filtrate was evaporated under reduced pressure to give a residue, which was purified by chromatography column on silica gel (petroleum ether/ethyl acetate=20:1) to give methyl 1-(1H-indol-5-yl)cyclopropanecarboxylate (2.2 g, 51%). 1H NMR (400 MHz, CDCl3) δ 7.61 (s, 1H), 7.33 (d, J=8.4 Hz, 1H), 7.23-7.18 (m, 2H), 6.52-6.51 (m, 1H) 3.62 (s, 3H), 1.65-1.62 (m, 2H), 1.29-1.23 (m, 2H).

Provenance & Evidence