反应详情

4-[2-(4-tert-Butyl-phenyl)-3H-imidazo[4,5-c]pyridin-7-yl]-piperazine-1-carboxylic acid benzyl ester 7 (12 mg, 0.026 mmol) was dissolved in THF (2 ml) with 10% Pd/C (10 mg) and allowed to stir under a hydrogen atmosphere for 12 hours. The reaction was judged complete by MS. 2-Ethyl-5-methyl-3H-imidazole-4-carbaldehyde 8 (7 mg, 0.05 mmol) and sodium triacetoxyborohydride (15 mg. 0.072 mmol) were added, and the reaction was allowed to stir for 12 hours. It was judged complete by MS, and the crude was purified by HPLC (Method E) to yield the title product 9 (4 mg (25%), 0.009 mmol). 1H NMR (CD3OD-d4): δ 8.58 (s, 1H), 8.12 (d, J=8.6 Hz, 2H), 7.72 (s, 1H), 7.58 (d, J=8.6 Hz, 2H), 3.93 (m, 5H), 3.25 (s, 3H), 3.05 (m, 3H), 2.79 (q, J=7.4 Hz, 2H), 1.35 (s, 9H). MS (ESI-POS): [M+H]+=458; MS (ESI-NEG):[M−H]−=456.

1. stirringto stir for 12 hours
2. customthe crude was purified by HPLC (Method E)