[OH:1][C:2]1([CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=2)[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[N:4]([N:11]2[CH2:16][CH2:15][O:14][CH2:13][CH2:12]2)[C:3]1=[O:17].[C:25](OC(=O)C)(=[O:27])[CH3:26]>CN(C)C1C=CN=CC=1.ClCCl>[C:25]([O:1][C:2]1([CH2:18][C:19]2[CH:24]=[CH:23][CH:22]=[CH:21][N:20]=2)[C:10]2[C:5](=[CH:6][CH:7]=[CH:8][CH:9]=2)[N:4]([N:11]2[CH2:12][CH2:13][O:14][CH2:15][CH2:16]2)[C:3]1=[O:17])(=[O:27])[CH3:26]A mixture of alcohol from Example 26 (63 mg, 0.194 mmole) 4-dimethylaminopyridine (78 mg, 0.639 mmole), acetic anhydride (0.06 ml, 0. 639 mmole) in dichloromethane (10 ml) was stirred at 0° C. for 8 hours. The volatiles were removed and the crude mixture applied directly to a silica gel column and eluted with 5% methanol in chloroform (Rf =0.34). The product slowly crystallized from hexane-ethyl acetate at 0° C. to give 41 mg of colorless cubes, m.p. 107°-110° C. after filtration. IR (KBr): 1702 cm-1. High Res. Mass Spec. Calcd. for C20H21N3O4 : 368.1610 (M+H). Found: 368. 1611.
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