[NH2:1][C@@H:2]([C:7]([OH:9])=[O:8])[C:3]([SH:6])([CH3:5])[CH3:4].[OH-].[Na+].Br[CH2:13][CH2:14][OH:15].C(=O)([O-])[O-].[Na+].[Na+].[C:22]([O:26][C:27]1[CH:32]=[CH:31][C:30]([S:33](Cl)(=[O:35])=[O:34])=[CH:29][CH:28]=1)#[C:23][CH2:24][CH3:25]>CO.CN(C=O)C>[CH2:22]([O:26][C:27]1[CH:32]=[CH:31][C:30]([S:33]([NH:1][C@H:2]([C:7]([OH:9])=[O:8])[C:3]([S:6][CH2:13][CH2:14][OH:15])([CH3:5])[CH3:4])(=[O:35])=[O:34])=[CH:29][CH:28]=1)[C:23]#[C:24][CH3:25]
A solution of D-penicillamine (0.5 g, 3.35 mmol) in methanol (5 mL) was cooled to 0° C. and crushed sodium hydroxide (0.28 g, 6.87 mmol) was added to give a clear solution. 2-Bromoethanol (0.26 mL, 3.71 mmol) was added and stirred at 0° C. for 1 h and at room temperature for an additional 1.5 h. The reaction was concentrated, and the oily residue was dissolved in 3 mL water and 6 mL DMF and stirred with sodium carbonate (0.82 g 7.2 mmol) and 4-butynyloxy-benzenesufonyl chloride (0.78 g, 3.18 mmol) at room temperature overnight. The reaction was concentrated and the residue was extracted with ethyl acetate and water. The aqueous layer was acidified to pH˜3 with concentrated HCl and extracted with ethyl acetate. The second ethyl acetate extract was washed with water and brine, dried over sodium sulfate, filtered and concentrated to obtain 1.2 g of N-{[4-(2 butynyloxy)phenyl]sulfonyl}-3-[(2-hydroxyethyl)sulfanyl]valine as an oil. Yield 89.6%. Electrospray Mass Spec 400.1 (M−H)−.
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