Methyl 4-oxocyclohexanecarboxylate → methyl 6-methoxy-2,3,4,9-tetrahydro-1H-carbazole-3-carboxylate

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(4-Methoxyphenyl)hydrazine hydrochloride (80.0 mg, 0.46 mmol) and methyl 4-oxocyclohexanecarboxylate (85.9 mg, 0.55 mmol) were dissolved in acetic acid (0.5 mL). The mixture was heated at 80° C. with stirring under nitrogen for 3 h, cooled, diluted with water (2 mL) and the resulting precipitate was collected by filtration, gently washed with water and dried in vacuo to yield the title compound (107 mg, 90%) as an off-white solid. C15H17NO3, Mr=259.30; 1H NMR (400 MHz, DMSO-d6) d: 1.81-1.91 (m, 1H), 2.15-2.19 (m, 1H), 2.66-2.84 (m, 4H), 2.90 (dd, J=4.6/14.2 Hz, 1H), 3.65 (s, 3H), 3.72 (s, 3H), 6.61 (dd, J=2.4/8.8 Hz, 1H), 6.86 (d, J=2.4 Hz, 1H), 7.11 (d, J=8.8 Hz, 1H), 10.51 (s, 1H); LCMS (ESI) tR: 2.27 min (>99%, ELSD), m/z: 260.2 [M+1]+.

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