Trifluoroacetic acid → HCID 68732367, compound

Participants

Reaction Steps

[(2-{4-[5-(5-Diethylaminomethyl-4-methyl-thiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-phenyl}-ethylcarbamoyl)-methyl]-methyl-carbamic acid tert-butyl ester is prepared in analogy to Example 163 by coupling 2-{4-[5-(5-diethylaminomethyl-4-methyl-thiophen-2-yl)-[1,2,4]oxadiazol-3-yl]-phenyl}-ethylamine (20 mg, 54 μmol) with (tert-butoxycarbonyl-methyl-amino)-acetic acid (15 mg, 81 μmol); LC-MS: tR=0.84 min; [M+1]+=542.20; 1H NMR (CDCl3): δ1.16 (m, 6H), 1.44 (s, 9H), 2.27 (s, 3H), 2.88 (s, 3H), 2.90-2.99 (m, 2H), 3.61 (q, J=6.5 Hz, 2H), 3.75 (s br, 1H), 3.85 (s, 2H), 7.34 (d, J=8.0 Hz, 2H), 7.67 (s, 1H), 8.10 (d, J=8.0 Hz, 2H). This material (18 mg, 30 μmol) is dissolved in DCM (2 mL) and TFA (50 μL) is added. The mixture is stirred at rt for 18 h before it is diluted with EA and washed with sat. aq. NaHCO3 solution. The organic extract is dried over Na2SO4, filtered and concentrated. The crude product is purified by prep. HPLC and on prep. TLC plates with DCM containing 10% of 7 N NH3 in methanol to give the title compound (12 mg) as a colourless solid; LC-MS: tR=0.64 min; [M+1]+=442.00.

Provenance & Evidence