tert-Butyl piperazine-1-carboxylate → 4-{2-[2-(2,4-Difluoro-phenyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1-thia-10-aza-benzo[e]azulen-9-yl}-piperazine-1-carboxylic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

9-Chloro-2-[2-(2,4-difluoro-phenyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1-thia-10-aza-benzo[e]azulene (208 mg×4, 2.0 mmol), tert-butyl piperazine-1-carboxylate (445 mg, 2.4 mmol), Pd(OAc) (45 mg, 0.20 mmol), Xphos (95 mg, 2.0 mmol), t-BuONa (460 mg, 4.0 mmol) and dioxane (4 mL) were added in a 10 mL of sealed tube, and the mixture was heated by microwave at 112° C. for 7 min under N2. The reaction mixture was filtered to gather the solution and water was added. The mixture was extracted by DCM (20 mL×3). The combined organic layers were dried over Na2SO4, concentrated in vacuo, and purified by preparative TLC (DCM/EtOAc=10:1) to give 4-{2-[2-(2,4-Difluoro-phenyl)-2H-[1,2,4]triazol-3-yl]-4,5-dihydro-6-oxa-1-thia-10-aza-benzo[e]azulen-9-yl}-piperazine-1-carboxylic acid tert-butyl ester (612 mg, yield: 54%). 1HNMR (DMSO-d6, 400 MHz): δ8.30 (s, 1H), 7.99-7.90 (m, 1H), 7.79-7.70 (m, 2H), 7.32 (s, 1H), 7.27 (s, 1H), 7.25 (s, 1H), 6.78 (d, J=8.8 Hz, 1H), 4.19 (s, 4H), 4.04-4.02 (m, 4H), 3.44 (m, 1H), 3.12 (s, 1H), 1.57 (s, 9H) ESI-MS: m/z=567 [M+H+]

Provenance & Evidence