[C:1]1([CH2:7][O:8][C:9]([NH:11][CH2:12][CH2:13][C:14]2[C:22]3[C:17](=[CH:18][CH:19]=[C:20]([C:23](O)=[O:24])[CH:21]=3)[NH:16][CH:15]=2)=[O:10])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.C(N1C=CN=C1)(N1C=CN=C1)=O.[BH4-].[Li+].C(O)(=O)C>O1CCCC1>[OH:24][CH2:23][C:20]1[CH:21]=[C:22]2[C:17](=[CH:18][CH:19]=1)[NH:16][CH:15]=[C:14]2[CH2:13][CH2:12][NH:11][C:9](=[O:10])[O:8][CH2:7][C:1]1[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1A solution of 3-[2-[[(phenylmethoxy)carbonyl]amino]ethyl]-1H-indole-5-carboxylic acid (9 g) and carbonyldiimidazole (5.2 g) in dry tetrahydrofuran (THF) (150 ml) was stirred vigorously under nitrogen at room temperature for 5 h. A solution of lithium borohydride (1.6 g) in dry THF (70 ml) was added over 70 min and the mixture then stirred for 18 h. Aqueous acetic acid (30%, 25 ml) was added slowly to the ice-cooled mixture and the solution was then partitioned between brine (25%, 300 ml) and ethyl acetate (250 ml). The organic layer was washed with sulphuric acid (0.4M, saturated with sodium chloride, 3×80 ml), brine (100 ml) and potassium carbonate solution (25%, 2×100 ml). The dried (MgSO4) solution was evaporated in vacuo, the residue taken up in dichloromethane (150 ml) and insoluble material was filtered off. The filtrate was evaporated in vacuo to leave the alcohol (9 g) as a colourless oil containing some (ca. 45 mole %) ethyl acetate. T.l.c. Si02 /Et2O, Rf 0.25.
読み込み中…
