1,1'-Carbonyldiimidazole → HCID 53357172, compound

Participants

Reaction Steps

Synthesis: To a solution of 4-(7-hydroxy-4-oxo-2-(trifluoromethyl)-4H-chromen-3-yl)benzoic acid (synthesis is described in PCT/US2010/024035) (100 mg, 0.28 mmol) in THF (10 ml) was added CDI (139 mg, 0.86 mmol) at room temperature. The mixture was stirred for 2 hours. MeSO2NH2 (280 mg, 2.86 mmol) was added in one portion, followed by DBU (394 mg, 2.86 mmol). The mixture was stirred for 4 hours and partitioned between 1N HCl (30 ml) and ethyl acetate (100 ml). The organic phase was separated, washed with brine (50 ml), dried over Na2SO4 and concentrated to give the desired product contaminated with the acid starting material. The mixture was difficult to purify and the acid contaminant was converted into the methyl ester by treatment with SOCl2 (91 mg, 0.77 mmol) in MeOH (4 ml) at 0° C. When the addition was complete, the mixture was stirred for 3 days. The volatiles were removed under reduced pressure and the residue was purified by prep-HPLC to afford the desired product in Example 10 as a white powder (25 mg, 20.5%).

Provenance & Evidence