2,2'-Dithiodibenzoyl chloride → 3,3'-[Dithiobis(2,1-phenylenecarbonylimino)]bis-2-thiophenecarboxylic acid, dimethyl ester

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A solution of 2,2'-dithiobisbenzoyl chloride (2.00 g, 5.83 mmol) in 50 mL of dichloromethane was added to a solution of methyl 3-amino-2-thiophenecarboxylate (1.82 g, 11.6 mmol) in 14 mL of pyridine at 23° C. The reaction mixture was stirred for 18 hours at 23° C. under nitrogen atmosphere. The precipitate formed was collected by filtration, then triturated with 5% aqueous HCl and washed with water to yield the crude product. The crude material was recrystallized first from ethanol, then from acetonitrile-DMF to yield 2.0 g of the title compound, mp 250°-252° C.

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