[CH2:1]([O:8][C:9]([NH:11][C@H:12]([CH2:22]Br)[CH2:13][CH2:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C([SnH](CCCC)CCCC)CCC.N(C(C)(C)C#N)=NC(C)(C)C#N.O>C1(C)C=CC=CC=1>[CH2:1]([O:8][C:9]([NH:11][C@H:12]([CH3:22])[CH2:13][CH2:14][C:15]([O:17][C:18]([CH3:21])([CH3:20])[CH3:19])=[O:16])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1To a solution of tert-butyl(4S)-4-{[(benzyloxy)carbonyl]amino}-5-bromopentanoate (4.5 g, 11.7 mmol) and tributyltin hydride (6.3 ml, 23.4 mmol) in toluene (45 ml) was added 2,2′-azobisisobutyronitrile (0.19 g, 1.2 mmol) and the mixture was stirred at 80° C. for 20 minutes. To the reaction mixture was added water, and the solution was extracted three times with ethyl acetate. The organic layer was washed with a saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate and the organic solvent was removed under reduced pressure. The residue was purified with silica gel chromatography to give tert-butyl (4R)-4-{[(benzyloxy)carbonyl]amino}pentanoate (3.5 g, 98%).
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