[C:1]([O:5][C:6](=[O:38])[NH:7][C:8]([C:10]1[CH:15]=[CH:14][C:13]([CH2:16][NH:17][C:18]([C@H:20]2[N:24]3[C:25](=[O:37])[C:26]([NH:29][CH2:30][C:31]4[CH:36]=CC=C[CH:32]=4)=[CH:27][N:28]=[C:23]3[CH2:22][CH2:21]2)=[O:19])=[CH:12][CH:11]=1)=[NH:9])([CH3:4])([CH3:3])[CH3:2].C(OC(=O)NC(C1C=CC(CNC([C@H]2N3C(=O)C(N)=CN=C3CC2)=O)=CC=1)=N)(C)(C)C.C(=O)C(C)C.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>>[C:1]([O:5][C:6](=[O:38])[NH:7][C:8]([C:10]1[CH:15]=[CH:14][C:13]([CH2:16][NH:17][C:18]([C@H:20]2[N:24]3[C:25](=[O:37])[C:26]([NH:29][CH2:30][CH:31]([CH3:32])[CH3:36])=[CH:27][N:28]=[C:23]3[CH2:22][CH2:21]2)=[O:19])=[CH:12][CH:11]=1)=[NH:9])([CH3:3])([CH3:2])[CH3:4]Following a procedure similar to that for the preparation of intermediate 1k, intermediate 1j (97.1 mg, 0.228 mmol), isobutyraldehyde (32.8 mg, 0.455 mmol) and NaBH(OAc)3 (135.1 mg, 0.638 mmol) yielded 87.4 mg (79%) of intermediate 7a. MS (ESI) 483.1 (M+H+).
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