Ethyl Acetate → {1-[4-(2-Phenyl-4-thioxo-4H-chromen-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester

Participants

Reaction Steps

To a solution of {1-[4-(4-oxo-2-phenyl-4H-chromen-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester (30 mg, 0.0642 mmol) in toluene (3 mL) was added Lawesson's reagent (2,4-bis-(4-methoxy-phenyl)-[1,3,2,4]dithiadiphosphetane 2,4-disulfide) (15.6 mg, 0.039 mmol). The reaction mixture was heated at reflux for 3 hours. The cooled mixture was subjected to flash chromatography (SiO2, 20% EtOAc in cyclohexane). A second chromatography (SiO2, 3% EtOAc in toluene) afforded the title compound (35 mg). LCMS (Method A): RT=5.08 min, [M+H]+=484.

Provenance & Evidence