Thiourea → 4-(9H-pyrido[2,3-b]indol-6-yl)thiazol-2-amine

Participants

Reaction Conditions

Reaction Steps

To a stirred suspension of 2-Bromo-1-(9H-pyrido[2,3-b]indol-6-yl)ethanone (100 mg, 0.346 mmol) in EtOH (2 mL) was added thiourea (26 mg, 1 equiv.) and the mixture was heated at 70° C. for 2 h. After cooling to room temperature, the solvent was evaporated to dryness. The resulting solid was stirred in a mixture of EtOAc/saturated aqueous NaHCO3 solution (2:1) until dissolution, and then extracted with EtOAc. The organic layer was washed with brine, dried over anhydrous MgSO4, filtered, and the solvent was removed under reduced pressure. Compound 13 was obtained as a white powder in 99% yield after trituration of the crude product in MeOH and filtration; 1H-NMR (300 MHz; DMSO-d6): δ 12.07 (bs, 1H), 8.57-8.45 (m, 2H), 8.47 (dd, 1H, J=1.5, 4.9 Hz), 7.85 (dd, 1H, J=1.7, 8.5 Hz), 7.57 (d, 1H, J=8.5 Hz), 7.28 (dd, 1H, J=5.0, 7.7 Hz), 7.08 (s, 1H); 13C-NMR (75 MHz; DMSO-d6): δ 170.1 (C), 150.9 (C), 145.1 (CH), 140.3 (C), 139.2 (C), 130.0 (CH), 125.0 (CH), 121.1 (C), 120.4 (C), 119.2 (CH), 116.0 (C), 115.6 (CH), 112.0 (CH), 100.7 (CH); MS (ESI) m/z 267.1 [M+H+]; HRMS (ESI): Calcd for C14H10N4S: 267.0704. Found: 267.0703

Provenance & Evidence