tert-Butyl 4-oxopiperidine-1-carboxylate → tert-Butyl 4-(7-(4-(benzyloxy)-2-oxopyridin-1(2H)-yl)-5-methyl-3,4-dihydro-1H-pyrido[4,3-b]indol-2(5H)-yl)piperidine-1-carboxylate

Participants

Reaction Steps

4-(Benzyloxy)-1-(5-methyl-2,3,4,5-tetrahydro-1H-pyrido[4,3-b]indol-7-yl)pyridin-2(1H)-one (100 mg, 0.26 mmol) and tert-butyl 4-oxopiperidine-1-carboxylate (27 mg, 0.26 mmol) were stirred in methylene chloride (1 mL) and AcOH (0.1 mL), and picoline borane complex (27 mg, 0.26 mmol) was added. After stirring for 16 h, the mixture was diluted with methylene chloride, washed with sodium carbonate solution and concentrated. The obtained residue was purified by flash column chromatography (silica gel, (1:1 EtOAc/hexanes)/(10:1 methanol/ammonia), 10:0 to 9:1) to provide the title compound (90 mg, 61%) as a white solid: 1H NMR (300 MHz, CDCl3) δ 7.45-7.36 (m, 5H), 7.32-7.30 (m, 1H), 7.32-7.27 (m, 2H), 6.99 (dd, J=8.2, 1.6 Hz, 1H), 6.05-6.01 (m, 2H), 5.05 (s, 2H), 4.20 (s, 2H), 3.85 (s, 2H), 3.60 (s, 3H), 3.04-2.93 (m, 2H), 2.88-2.66 (m, 5H), 1.98-1.87 (m, 2H), 1.60-1.54 (m, 2H), 1.47 (s, 9H).

Provenance & Evidence