Hydrochloric Acid → glucagon receptor antagonists-4

Participants

Reaction Conditions

Reaction Steps

To the solution from step 5 was added methanol (40 mL), water (54 mL) and sodium hydroxide (4.34 g, 108 mmol). The reaction was stirred 1 h at 30° C. The solution was acidified with conc. HCl (9.33 mL) and the aq. phase split. The organic solution was washed with 1 N HCl (40 mL). The organic phase was concentrated and the residue taken up in acetonitrile (300 mL). The solution was cooled to 0° C. and stirred 5 h. The solid product was filtered and washed with cold acetonitrile, giving the desired compound as a white solid (14.6 g, 80% yield). 1H NMR (400 MHz, CDCl3) δ: 7.88 (s, 1H), 7.72 (d, J=8.3 Hz, 2H), 7.65 (s, 1H), 7.38 (d, J=8.3 Hz, 2H), 6.89 (t, J=6.2 Hz, 1H), 6.55 (s, 2H), 5.15 (dd, J=7.8, 4.6 Hz, 1H), 3.68 (q, J=6.2 Hz, 2H), 2.65 (t, J=6.2 Hz, 2H), 1.95 (m, 1H), 1.86 (s, 6H), 1.78 (m, 1H), 1.55-1.38 (m, 2H), 0.94 (t, J=7.4 Hz, 3H). The final compound was recrystallized from acetonitrile (5 vol). The compound was heated to 80° C. and then cooled to 0° C. to provide a purity of 99.01%.

Provenance & Evidence