4-Fluorobenzoyl isothiocyanate → tert-Butyl 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate

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Reaction Conditions

Reaction Steps

tert-Butyl 2-amino-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate (0.28 g, 1.00 mmol) and 4-fluorobenzoyl isothiocyanate (0.18 g, 0.99 mmol) were dissolved in THF (5 mL) and heated at 50° C. for 22 hours. The solvent was removed and EtOH (10 mL) was added. The product was filtered and rinsed with EtOH (2×10 mL). tert-Butyl 2-(3-(4-fluorobenzoyl)thioureido)-5,5-dimethyl-5,7-dihydro-4H-thieno[2,3-c]pyran-3-carboxylate (0.330 g, 0.71 mmol, 71% yield) was isolated as a pale yellow solid. 1H NMR (400 MHz, CDCl3) δ 14.70 (s, 1H), 9.01 (s, 1H), 8.00-7.94 (m, 2H), 7.25-7.18 (m, 2H), 4.74 (apparent t, J=1.5 Hz, 2H), 2.76 (apparent t, J=1.5 Hz, 2H), 1.64 (s, 9H), 1.31 (s, 6H).

Provenance & Evidence