Sodium cyanoborohydride → 4-[2(R)-tert-butoxycarbonylamino-3-triphenylmethylthiopropyl]amino-2-phenylbenzoyl-(S)-methionine methyl ester

Reaction equation

Cl.[CH3:2][O:3][C:4](=[O:26])[C@H:5]([CH2:22][CH2:23][S:24][CH3:25])[NH:6][C:7](=[O:21])[C:8]1[CH:13]=[CH:12][C:11]([NH2:14])=[CH:10][C:9]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.[C:27]([NH:34][C@H:35]([CH:57]=O)[CH2:36][S:37][C:38]([C:51]1[CH:56]=[CH:55][CH:54]=[CH:53][CH:52]=1)([C:45]1[CH:50]=[CH:49][CH:48]=[CH:47][CH:46]=1)[C:39]1[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=1)([O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:28].C([BH3-])#N.[Na+]>CO>[CH3:2][O:3][C:4](=[O:26])[C@H:5]([CH2:22][CH2:23][S:24][CH3:25])[NH:6][C:7](=[O:21])[C:8]1[CH:13]=[CH:12][C:11]([NH:14][CH2:57][C@@H:35]([NH:34][C:27]([O:29][C:30]([CH3:31])([CH3:33])[CH3:32])=[O:28])[CH2:36][S:37][C:38]([C:39]2[CH:44]=[CH:43][CH:42]=[CH:41][CH:40]=2)([C:51]2[CH:52]=[CH:53][CH:54]=[CH:55][CH:56]=2)[C:45]2[CH:46]=[CH:47][CH:48]=[CH:49][CH:50]=2)=[CH:10][C:9]=1[C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1