[Cl:1][C:2]1[CH:45]=[CH:44][C:5]([O:6][C:7]2[CH:12]=[CH:11][C:10]([N:13]3[CH:17]=[C:16]([C:18]4[CH:39]=[CH:38][C:21]([O:22][CH2:23][C:24]([N:26]5[CH2:31][CH2:30][N:29]([C:32]6[CH:37]=[CH:36][N:35]=[CH:34][CH:33]=6)[CH2:28][CH2:27]5)=O)=[CH:20][CH:19]=4)[N:15]=[C:14]3[CH2:40][CH:41]([CH3:43])[CH3:42])=[CH:9][CH:8]=2)=[CH:4][CH:3]=1.B.C1COCC1>C1COCC1>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:6][C:7]2[CH:12]=[CH:11][C:10]([N:13]3[CH:17]=[C:16]([C:18]4[CH:39]=[CH:38][C:21]([O:22][CH2:23][CH2:24][N:26]5[CH2:27][CH2:28][N:29]([C:32]6[CH:37]=[CH:36][N:35]=[CH:34][CH:33]=6)[CH2:30][CH2:31]5)=[CH:20][CH:19]=4)[N:15]=[C:14]3[CH2:40][CH:41]([CH3:42])[CH3:43])=[CH:9][CH:8]=2)=[CH:44][CH:45]=1The product of Example 522 was taken in 4 ml of THF to which was added 5 eq. of BH3-THF solution and the reaction was heated to reflux until the reaction was complete. The crude product was purified by silica gel chromatography to afford Example 527.
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