Dimethyl acetylenedicarboxylate → Methyl [3-cyclohexyl-2-(cyclohexylimino)-4-oxo-5-thiazolidinylidene]acetate

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Reaction Steps

A mixture of N,N'-dicyclohexylthiourea (10.0 g, 42 mmoles) and dimethylacetylenedicarboxylate (7.8 g, 55 mmoles) in methanol (100 mls) is stirred at room temperature for 16 hours, then warmed on a steambath for 45 minutes and cooled. The precipitate is filtered off, rinsed with cold methanol and dried. This gave the product as white crystals, (11.3 g), mp 97°-98° C.

Provenance & Evidence