[F:1][C:2]([F:18])([F:17])[C:3]([NH:5][C@@H:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C:9](=[O:16])[CH2:8][CH2:7]1)=[O:4].C(N(CC)CC)C>CN(C=O)C>[F:1][C:2]([F:17])([F:18])[C:3]([NH:5][C@@H:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C@H:9]([OH:16])[CH2:8][CH2:7]1)=[O:4]Degassed DMF (argon sparged, 100 mL) was added to Intermediate Ab (8.00 g, 31.3 mmol) and [N-[(1R,2R)-2-(amino-κN)-1,2-diphenylethyl]-4-methylbenzenesulfonamidato-κN]chloro[(1,2,3,4,5,6-n)-1-methyl-4-(1-methylethyl)benzene]-ruthenium (Strem Chemicals Inc.; 594 mg, 0.93 mmol). Triethylamine (8.66 mL, 62.6 mmol) was added slowly to ice cold formic acid (2.34 mL, 62.6 mmol) and stirred for 20 min, this was then added to the DMF solution. The reaction was heated to 60° C. for 18 h. After cooling, the mixture was partitioned between DCM (200 mL) and water (600 mL). The aqueous layer was extracted DCM (3×) and the combined organic layers washed with brine, dried (MgSO4) and concentrated in vacuo. Purification by FCC, using 0-100% EtOAc in cyclohexane, afforded the title compound (7.10 g, 27.4 mmol, 88%). 1H NMR (400 MHz, CDCl3): 1.88-1.92 (1H, d, J=4.8 Hz), 1.98-2.18 (4H, m), 4.80-4.88 (1H, m), 5.165-5.24 (1H, m), 6.70-6.80 (1H, br s), 7.25-7.30 (1H, m), 7.30-7.40 (2H, m), 7.45-7.50 (1H, m).
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