[F:1][C:2]1[CH:7]=[C:6]([N+:8]([O-])=O)[CH:5]=[CH:4][C:3]=1[N:11]1[CH2:16][CH2:15][Si:14]([CH3:18])([CH3:17])[CH2:13][CH2:12]1.C([O-])(O)=O.[Na+].[C:24](Cl)([O:26][CH2:27][C:28]1[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=1)=[O:25].O>C1COCC1.[Pd]>[CH3:17][Si:14]1([CH3:18])[CH2:15][CH2:16][N:11]([C:3]2[CH:4]=[CH:5][C:6]([NH:8][C:24](=[O:25])[O:26][CH2:27][C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)=[CH:7][C:2]=2[F:1])[CH2:12][CH2:13]1
To a solution of compound 9 (610 mg, 2.28 mmol) in THF (25 mL), Pd/C (30 mg) is added and hydrogenated under a pressure of 35 psi in a par hydrogenator for 8 h. The reaction mixture is filtered through celite. Celite pad is washed with THF (2×20 mL). To the filtrate, saturated NaHCO3 (420 mg, 5.01 mmol) and CBzCl (427 mg, 2.5 mmol) are added at 0° C. and stirred at 25° C. for 5 h. 10 mL water is added to reaction mixture and the aqueous layer is extracted with EtOAc (2×20 mL). The crude mixture is then subjected to column chromatography on silica gel using hexane-EtOAc mixtures to afford the product as a viscous liquid 10 (690 mg) in 82% yield.
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