反应详情

Chloro-acetyl chloride (0.25 mL; 3.14 mmol; 1.1 eq.) was added dropwise over 2 min to a solution of 2-[4-(4-Iodo-pyrazol-1-yl)-cyclohexylamino]-ethanol (intermediate 25; 1.0 g; 2.89 mmol; 1.0 eq.) and DIEA (2.00 ml; 11.45 mmol; 3.96 eq.) in THF (80.00 mL) at −30° C. The reaction solution was allowed to warm slowly to RT and stirred for 16 h. It was then poured into a 1 N HCl solution and extracted with DCM. Combined organic phases were washed with saturated NaHCO3 solution, dried over magnesium sulfate, filtrated and concentrated to give 2-Chloro-N-(2-hydroxy-ethyl)-N-[4-(4-iodo-pyrazol-1-yl)-cyclohexyl]-acetamide as a brown oil. This oil was redissolved in THF (30 mL; 370 mmol; 128 eq.) and sodium tert-butoxide (2M solution in THF; 30 mL; 60.0 mmol; 21 eq.) was added in one portion. The reaction solution was heated at 40° C. for 1 h then cooled to RT and poured into 1 N HCl solution. It was extracted with DCM (twice). Combined organic phases were washed with brine, dried over magnesium sulfate, filtered and concentrated. The residue was triturated sequentially with EtOAc and Et2O, filtered and dried to give the title compound as a yellow solid (275 mg; 21%). 1H NMR (300 MHz, DMSO) δ 7.98 (s, 1H), 7.50 (s, 1H), 4.40-4.25 (m, 1H), 4.25-4.10 (m, 1H), 4.03 (s, 2H), 3.87-3.75 (m, 2H), 3.32-3.23 (m, 2H), 2.14-1.99 (m, 2H), 1.93-1.60 (m, 6H). MS (ESI+): 376.2.

1. extractionextracted with DCM
2. washCombined organic phases were washed with saturated NaHCO3 solution
3. dry with materialdried over magnesium sulfate
4. filtrationfiltrated
5. concentrationconcentrated