N-bromobutanimide → HCID 53353198, compound

Participants

Reaction Steps

In a 250 ml round bottom flask was added (R)—N-(1-cyclopropyl-1H-pyrrolo[3,2-c]pyridin-6-yl)-4-(1,2-dihydroxypropan-2-yl)benzamide (17, 3.2 g, 9.2 mmol) in N,N-dimethylformamide (31 ml). The mixture was cooled in ice bath, followed by addition of N-bromosuccinimide (1.477 g, 8.30 mmol) in portions. The mixture was stirred in ice bath for 30 min, at which point about ˜10% starting material remained. Another 0.1 equivalence (160 mg) of N-bromosuccinimide was added to the reaction mixture, which was stirred in an ice bath for another 30 min. Brine (200 ml) was added, followed by extraction with EtOAc (2×200 mL). Organic layers were combined. After drying and filtering, a suspension was obtained upon concentration. The solid was collected on a filtered, and then washed with 10 ml EtOAc. The resulting 2 g of filtrated solid was purified by silica gel column chromatography, eluting with 5-10% MeOH in EtOAc. Product-containing fractions were combined and concentrated to yield a solid which was washed twice with EtOAc (2×10 ml). The title compound (22, 0.62 g, 16%) was obtained as a pink solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 0.98-1.04 (m, 2H) 1.05-1.13 (m, 2H) 1.42 (s, 3H) 3.42-3.54 (m, 3 H) 4.71 (t, J=5.81 Hz, 1H) 4.99 (s, 1H) 7.58 (d, J=8.59 Hz, 2H) 7.62 (s, 1H) 8.01 (d, J=8.59 Hz, 2H) 8.48 (d, J=0.76 Hz, 2H) 8.51 (d, J=0.76 Hz, 2H) 10.63 (s, 1H); ESI-MS: m/z 432 (M+H)+. Additional amounts of the title compound were obtained by combining filtrates and re-purifying them by silica gel column chromatography.

Provenance & Evidence