Acetic Acid → HCID 66604600, compound

Participants

Reaction Steps

A suspension of methyl 2-(3-chlorophenyl)-7-formyl-5H-pyrido[3,2-b]indole-4-carboxylate (80 mg, 0.22 mmol) in DMF (1 mL) was stirred for 5 min and then diluted with DCM (10 mL). 1-tert-butylpiperazine (38 mg, 0.26 mmol) was added and the suspension was cooled in an ice bath. Sodium triacetoxyborohydride (125 mg, 0.592 mmol) was added and the suspension was left stirring for 0.5 hr. Acetic acid (0.025 mL, 0.44 mmol) was then added and the bath removed. The reaction was left stirring at RT overnight, diluted with DCM, and washed with sat. aq. NaHCO3 solution followed by water (2×). After drying with sodium sulfate, the solvent was removed and radial chromatography (step gradient elution with DCM containing 0 to 3% MeOH) afforded methyl 7-((4-tert-butylpiperazin-1-yl)methyl)-2-(3-chlorophenyl)-5H-pyrido[3,2-b]indole-4-carboxylate (45 mg, 0.092 mmol, 42% yield) as a yellow solid. MS (ESI) m/z 491.19 (M+H). 1H NMR (500 MHz, chloroform-d) δ ppm 9.49 (1H, s), 8.36 (1H, d, J=7.94 Hz), 8.24 (1H, s), 8.20 (1H, s), 8.04 (1H, d, J=7.63 Hz), 7.53 (1H, t, J=7.78 Hz), 7.35-7.39 (1H, m), 7.33 (1H, d, J=7.93 Hz), 4.09 (3H, s), 3.70 (2H, s), 2.63 (8H, br. s.), 1.07 (9H, s).

Provenance & Evidence