1,1,1,3,3,3-Hexafluoro-2-propanol → HCID 71656795, compound

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Reaction Steps

A 50 mL round-bottom flask was charged with 1,1,1,3,3,3-hexafluoropropan-2-ol (336 mg, 2.00 mmol, 1.00 equiv), acetonitrile (20 mL), triphosgene (198 mg, 0.670 mmol, 0.330 equiv). N,N-diisopropylethylamine (942 mg, 7.29 mmol, 3.65 equiv) was added dropwise. The mixture was stirred for 2 hours at room temperature. Then 1-[bis(4-chlorophenyl)methyl]-2-methylpiperazine (670 mg, 2.00 mmol, 1.00 equiv) was added. The resulting solution was stirred for 2 hours at room temperature and diluted with H2O (20 mL). The resulting solution was extracted with dichloromethane (3×20 mL) and the organic layers were combined, washed with water (3×20 mL) and 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 (1/5). The product (218 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% over 0.1 min, and holding at 20% for 1.9 min, on a waters 2767-5 chromatograph. Column: X-bridge Prep C18, 19*150 mm Sum; Mobile phase: Phase A: aqueous NH4HCO3 (0.05%); Phase B: CH3CN; Detector, UV220 & 254 nm. Purification resulted in 56.4 mg (5% yield) of 1,1,1,3,3,3-hexafluoropropan-2-yl 4-[bis(4-chlorophenyl)methyl]-3-methylpiperazine-1-carboxylate as a light yellow solid. 1H NMR 300 MHz (CDCl3) δ 7.26-7.36 (m, 8H), 5.69-5.77 (m, 1H), 4.56-4.62 (m, 1H), 3.81-3.93 (m, 1H), 3.67-3.75 (m, 1H), 3.34-3.38 (m, 1H), 3.11-3.28 (m, 1H), 2.97 (br, 1H), 2.39-2.58 (m, 2H), 0.95-0.99 (m, 3H). LCMS: (ESI, m/z): 528 [M+H]+.

Provenance & Evidence