1,1,1,3,3,3-Hexafluoro-2-propanol → HCID 71657398, compound

Participants

Reaction Steps

A 50 mL round-bottom flask was charged with 1,1,1,3,3,3-hexafluoropropan-2-ol (168 mg, 1.00 mmol, 1.00 equiv), triphosgene (99.0 mg, 0.330 mmol, 0.33 equiv), dichloromethane (10 mL). N,N-Diisopropylethylamine (417 mg, 3.23 mmol, 3.18 equiv) was added dropwise. The mixture was stirred for 2 hours at room temperature. 4-[4-Chloro-2-(piperazin-1-ylmethyl)phenyl]morpholine (300 mg, 1.01 mmol, 1.00 equiv) was added dropwise. The resulting solution was stirred for 2 hours at room temperature and diluted with water (20 mL). The resulting solution was extracted with dichloromethane (2×10 mL) and the organic layers were combined, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was chromatographed on a silica gel column with ethyl acetate/petroleum ether (1/3). The crude product (206 mg) was purified by preparative HPLC using the following gradient conditions: 20% CH3CN/80% Phase A increasing to 80% CH3CN over 10 min, then to 100% CH3CN over 0.1 min, holding at 100% CH3CN for 1.9 min, then reducing to 20% CH3CN over 0.1 min, and holding at 20% for 1.9 min, on a Waters 2767-5 aqueous NH4HCO3 (0.05%); Phase B: CH3CN; Detector, UV220 & 254 nm. Purification resulted in 91.9 mg (18% yield) of 1,1,1,3,3,3-hexafluoropropan-2-yl 4-[[5-chloro-2-(morpholin-4-yl)phenyl]methyl]piperazine-1-carboxylate as a white solid. 1HNMR 300 MHz (CDCl3) δ 7.45 (s, 1H), 7.23 (d, J=9.0 Hz, 1H), 7.04 (d, J=9.0 Hz, 1H), 5.69-5.81 (m, 1H), 3.81-3.84 (m, 4H), 3.56 (br, 6H), 2.88-2.91 (m, 4H), 2.50 (br, 4H). LCMS (ESI, m/z): 490 [M+H]+.

Provenance & Evidence