HCID 66782407, compound → HCID 66782284, compound

Participants

Reaction Steps

A solution of crude N-[1-[Benzothiazol-4-ylmethyl-(2,2-diethoxy-ethyl)-carbamoyl]-2-(4-tert-butoxy-phenyl)ethyl]-3-(3-benzyl-ureido)-butyramide (3.55 g, 4.95 mmol) in formic acid (100 mL) was stirred at room temperature for 13 h. The solvent was removed under reduced pressure and then diluted with EtOAc, washed with water and brine. The organic layer was dried with Na2SO4 and concentrated in vacuo. The residue was purified by chromatography and recrystallized on ethyl acetate and hexane to give 8-Benzothiazol-4-ylmethyl-6-(4-hydroxy-benzyl)-2-methyl-4,7-dioxo-hexahydro-pyrazino[1,2-a]pyrimidine-1-carboxylic acid benzylamide (1.05 g, 3 step yield: 32%). 1H NMR (CDCl3, 300 MHz) δ 9.25 (s, 1H), 7.4˜7.26 (m, 3H), 7.2 (d, J=7.01, 2H), 6.98 (t, J=8.0, 1H), 6.85 (m, 3H), 6.8 (t, J=7.0, 1H), 6.5 (d, J=8.76, 2H), 5.6 (m, 1H), 5.25 (t, J=4.7, 1H), 4.55 (m, 1H), 4.5˜4.25 (m, 4H), 3.5˜3.3 (m, 2H), 3.25˜3.1 (m, 2H), 2.2 (t, J=7.2, 2H) 1.45 (m, 3H) MS ESI 570 (M+H), 592 (M+Na).

Provenance & Evidence