Acetyl chloride → diethyl 1-oxo-6b,9,10,10a-tetrahydro-1H-pyrido[3',4':4,5]pyrrolo[1,2,3-de]quinoxaline-3,8(2H,7H)-dicarboxylate

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Reaction Steps

To a solution of ethyl 6-[(ethoxycarbonyl)amino]-1,3,4,4a,5,9b-hexahydro-2H-pyrido[4,3-b]indole-2-carboxylate (2.2 g, 6.6 mmol) in DMF (20 mL) at 0° C. was added NaH (660 mg, 16.5 mmol), DMAP (878 mg, 7.2 mmol), acetyl chloride (0.6 mL, 7.2 mmol) and stirred at rt for 16 hours. The solution was diluted with water (30 mL), and extracted with EtOAc (2×30 mL). The combined extracts were dried over magnesium sulfate, concentrated, and purified by flash chromatography to afford diethyl 1-oxo-6b,9,10,10a-tetrahydro-1H-pyrido[3′,4′:4,5]pyrrolo[1,2,3-de]quinoxaline-3,8(2H,7H)-dicarboxylate (1.1 g, 57%) as a clear oil. MS [M+H]+ 374. 1H NMR (CDCl3, 300 MHz): δ 6.75 (t, 1H, J=7.7 Hz), 6.59 (m, 1H), 6.45 (m, 1H), 4.05 (m, 1H), 3.60–4.00 (m, 7H), 3.40 (m, 1H), 3.00 (m, 3H), 1.92 (m, 2H), 0.91 (m, 1H), 0.85 (m, 6H) ppm.

Provenance & Evidence