[S:1]1[C:5]([C:6](O)=[O:7])=[CH:4][CH:3]2[S:9][CH:10]=[CH:11][CH:2]12.C1C=C[C:15]2[N:20]([OH:21])N=NC=2C=1.[CH3:22]CN(C(C)C)C(C)C.CCN=C=NCCCN(C)C>CN(C=O)C.CCOC(C)=O>[CH3:22][O:21][N:20]([CH3:15])[C:6]([C:5]1[S:1][CH:2]2[CH:11]=[CH:10][S:9][CH:3]2[CH:4]=1)=[O:7]
3a,6a-Dihydro-thieno[3,2-b]thiophene-2-carboxylic acid (2 g, 10.86 mmol) MeNHOMe—HCl (1.06 g, 10.86 mmol), HOBt (1.47 g, 10.86 mmol) and DIPEA (5.9 mL, 33.67 mmol) were combined in DMF (40 mL). To the stirred mixture was added EDCI (2.72 g, 14.12 mmol). After 5 h, EtOAc (100 mL) was added and the organics were washed with saturated aqueous NaHCO3 and brine then dried over MgSO4, filtered and concentrated. The crude residue was purified by silica column chromatography (20% to 45% EtOAc/Hex) to afford the title compound (1.98 g, 80%).
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