Acetic Acid → HCID 86682415, compound

Participants

Reaction Steps

To a solution of {8-[(1S,2S)-2-{[tert-butyl(dimethyl)silyl]oxy}cyclohexyl]-5-[(6-chloropyridin-3-yl)methyl]-7-oxo-8,9-dihydro-7H-pyrrolo[3,4-h]quinolin-9-yl}acetaldehyde (see Example 22, 0.033 g, 0.058 mmol) in 1.2 mL of 1,2-dichloroethane was added dimethylamine (2 M in tetrahydrofuran, 0.059 mL, 0.12 mmol), acetic acid (0.0034 mL, 0.058 mmol), sodium cyanoborohydride (3.7 mg, 0.058 mmol), and 4 Å molecular sieves. The mixture was irradiated in a microwave reactor at 100° C. for 20 min, cooled to ambient temperature, and filtered. The filtrate was diluted with ethyl acetate and washed with saturated aqueous sodium bicarbonate. The aqueous layer was extracted with ethyl acetate and the combined organic extracts were dried with sodium sulfate, filtered, and concentrated in vacuo. The residue was dissolved in 2 mL of dichloromethane and treated with hydrochloric acid (6 M aqueous, 4 drops). After 14 hr, the mixture was diluted with dichloromethane, washed 2× with saturated aqueous sodium bicarbonate, dried with sodium sulfate, filtered, and concentrated in vacuo. The residue was purified via preparative reverse phase HPLC to provide the title compound that gave a proton NMR spectra consistent with theory and a mass ion (ES+) of 479.2200 for [M+H]+ [calc'd for C27H32CN4O2, [M+H]+=479.2208]: 1H NMR (400 MHz, CDCl3) δ 8.97-8.96 (m, 1H), 8.34-8.28 (m, 2H), 7.78 (s, 1H), 7.54-7.50 (m, 1H), 7.44-7.40 (m, 1H), 7.24 (d, J=8.3 Hz, 1H), 5.21-5.19 (m, 1H), 4.69-4.51 (m, 1H), 4.47 (s, 2H), 3.42-3.33 (m, 1H), 3.29-3.15 (m, 2H), 2.76-2.63 (m, 1H), 2.49 (s, 6H), 2.29-2.17 (m, 2H), 1.81-1.68 (m, 2H), 1.48-1.00 (m, 5H) ppm.

Provenance & Evidence