Bicyclo[2.2.1]heptane-1-methanesulfonic acid, 7,7-dimethyl-2-oxo-, (1S)- → 4,4-difluoro-6'-(5-methyl-1H-pyrazol-4-yl)-1'H-spiro[cyclohexane-1,2'-thieno[3,2-d]pyrimidin]-4'(3'H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-amino-5-(5-methyl-1H-pyrazol-4-yl) thiophene-2-carboxamide (100 mg, 0.45 mmol), 4,4-difluorocyclohexanone (181 mg, 1.35 mmol), CSA (10 mg, 0.045 mmol), MgSO4 (108 mg, 0.90 mmol) and DMA (1 mL) was stirred at 80° C. for 2 h. The mixture was poured into saturated aqueous NaHCO3. The organic materials were extracted with EtOAc. The combined extracts were washed with water and brine, dried over Na2SO4 and filtered. After removal of the solvent at reduced pressure, the residue was purified by column chromatography (Purif, silica gel, 90:10 hexane/EtOAc to EtOAc), then crystallized from MeOH/EtOAc to give the title compound (59 mg, 39%) as a pale yellow solid:

Provenance & Evidence