Methanesulfonyl chloride → HCID 86646454, compound

Participants

Reaction Steps

To a solution of {4-[5-(5-diethylaminomethyl-4-methyl-thiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-phenyl}-methanol (971 mg, 2.72 mmol) in DCM (40 mL), DIPEA (526 mg, 4.07 mmol) and methanesulfonyl chloride (373 mg, 3.26 mmol) is added. The reaction mixture is stirred at rt for 15 h before it is diluted with DCM and washed with sat. aq. NaHCO3 solution. The washing is extracted back three times with DCM. The combined organic extracts are dried over MgSO4, filtered, concentrated and dried to give crude methanesulfonic acid 4-[5-(5-diethylaminomethyl-4-methyl-thiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-benzyl ester (1.48 g) as an orange solid containing {5-[3-(4-chloromethyl-phenyl)-[1,2,4]oxadiazol-5-yl]-3-methyl-thiophen-2-ylmethyl}-diethyl-amine; LC-MS: tR=0.58 min; [M+1]+=436.11. b) A solution of the above crude methanesulfonic acid 4-[5-(5-diethylaminomethyl-4-methyl-thiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-benzyl ester (248 mg, 0.569 mmol) in 7 N NH3 in methanol (10 mL) is stirred in a sealed vial at 80° C. for 16 h. The solvent is removed in vacuo and the residue is dissolved in EA and washed with brine and water. The organic extract is dried over MgSO4, filtered and concentrated. The crude product is purified on prep. TLC plates with DCM containing 5% of 7N NH3 in methanol to give the title compound (137 mg) as a pale yellow oil; LC-MS: tR=0.38 min; [M+1]+=357.30; 1H NMR (CDCl3): δ 1.11 (t, J=7.0 Hz, 6H), 2.26 (s, 3H), 2.64 (q, J=7.0 Hz, 4H), 3.73 (s, 2H), 3.98 (s, 2H), 7.47 (d, J=7.8 Hz, 2H), 7.67 (s, 1H), 8.13 (d, J=7.5 Hz, 2H).

Provenance & Evidence