C(Cl)(=O)C(Cl)=O.CS(C)=O.[CH2:11]([O:18][C:19](=[O:31])[NH:20][CH2:21][CH2:22][C:23](=[O:30])[NH:24][CH2:25][CH:26]([OH:29])[CH2:27][CH3:28])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1.C(N(CC)CC)C>C(Cl)Cl>[CH2:11]([O:18][C:19](=[O:31])[NH:20][CH2:21][CH2:22][C:23](=[O:30])[NH:24][CH2:25][C:26](=[O:29])[CH2:27][CH3:28])[C:12]1[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1To a stirred solution of oxalyl chloride (2 M in DCM) (13.35 ml, 26.5 mmol) in dry DCM at −78° C. is added dropwise DMSO (2.5 ml, 35.4 mmol). After stirring for 15 minutes, the reaction mixture is treated with a solution of [2-(2-hydroxy-butylcarbamoyl)-ethyl]-carbamic acid benzyl ester (step 1) (6.5 g, 22.1 mol) in dry DCM (40 ml). Triethylamine (13 ml) is added after 1 hour and after stirring at −78° C. for 90 minutes, the reaction mixture is allowed to warm to room temperature. The reaction is diluted with DCM (100 ml) and washed with HCl (1M, 200 ml), saturated sodium bicarbonate solution (200 ml), water (200 ml) and brine (200 ml). The organic portion is dried over MgSO4, filtered and concentrated in vacuo to yield the titled compound as a white solid.
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