N(C(OCC)=O)=NC(OCC)=O.[Cl:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][C:15]=1[CH:20]([OH:22])[CH3:21].C1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=CC=1.[CH3:42][O:43][C:44]([C:46]1[S:47][C:48]([C:52]([O:54][CH3:55])=[O:53])=[CH:49][C:50]=1O)=[O:45]>C1COCC1>[CH3:42][O:43][C:44]([C:46]1[S:47][C:48]([C:52]([O:54][CH3:55])=[O:53])=[CH:49][C:50]=1[O:22][CH:20]([C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][C:14]=1[Cl:13])[CH3:21])=[O:45]Diethyl azodicarboxylate (1.29 g, 7.41 mmol, 1.3 Eq.) was added to a stirred solution of 1-(2-Chloro-phenyl)-ethanol (893 mg, 5.70 mmol, 1.0 Eq.), triphenylphosphine (1.94 g, 7.41 mmol, 1.3 Eq.) and 3-hydroxythiophene-2,5-dicarboxylic acid dimethyl ester (1.23 g, 5.70 mmol, 1.0 Eq.) in anhydrous THF (20 mL) at 0° C. under nitrogen and the reaction allowed to warm to ambient temperature overnight. The crude reaction mixture was concentrated in vacuo and purified by column chromatography (10% EtOAc/Petroleum ether) to give the sub-title compound as a white solid (1.94 g, 5.6 mmol, 93%); 1H NMR (400 MHz, CDCl3) δ 1.71 (3H, d), 3.89 (3H, s), 3.95 (3H, s), 5.80 (1H, q), 7.20-7.32 (3H, m), 7.39 (1H, d), 7.66 (1H, d).
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