4,5-Dihydro-2-thiazolamine → 2,3,8,9-Tetrahydro-5-(4-methoxy-2,5-dimethylphenyl)-9-[(4-methoxy-2,5-dimethylphenyl)methylene]-5H,6H-pyrano[4,3-d]thiazolo[3,2-a]pyrimidine

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A stirred solution of tetrahydro-3,5-bis[(4-methoxy-2,5-dimethylphenyl)methylene]-4H-pyran-4-one (3.0 g, 7.6 mmole) and 2-amino-2-thiazoline (1.0 g, 9.7 mmole) in 75 ml of CHCl3 is heated at reflux temperature for 72 hours. After cooling, the solution is filtered to remove a small amount of insoluble material. The solvent is evaporated to give an oily residue. A solution of this material in 25 ml of EtOH yields 1.7 g of light yellow solid, m.p. 195°-197°. Crystallization from 20 ml of 10% DMF/MeOH gives 1.3 g (35%) of cream colored solid, m.p. 196°-198°.

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