[ClH:1].C(OC(=O)[NH:8][CH:9]([C:12]([C:14]1[O:15][C:16]2[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=2[N:18]=1)=[O:13])[CH2:10][CH3:11])(C)(C)C>O1CCOCC1.C(Cl)Cl>[ClH:1].[NH2:8][CH:9]([CH2:10][CH3:11])[C:12]([C:14]1[O:15][C:16]2[CH:22]=[CH:21][CH:20]=[CH:19][C:17]=2[N:18]=1)=[O:13]Hydrogen chloride in dioxane (1M, 1 ml) was added to a solution of, 1-(Benzooxazole-2-carbonyl)-propyl]-carbamic acid tert-butyl ester (2a) in dry methylene chloride (3 ml) and stirred at room temperature for 4 hrs. Concentration under reduced pressure gave the title compound as white solid (65 mg); 1H NMR (CDCl3) δ 0.99 (t, J=7.5 Hz, 3H), 2.20–2.05 (m, 2H), 4.96 (m, 1H), 7.58 (t, J=7.4 Hz, 1H), 7.69 (t, J=7.4 Hz, 1H), 7.94 (d, J=8.2 Hz, 1H), 8.04 (d, J=8.2 Hz, 1H), 8.75 (m, 3H); MS: 207(MH+).
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