Methyl iodide → (1-[4-(7-Methyl-4-oxo-2-phenyl-4,7-dihydro-pyrano[2,3-e]indazol-3-yl)-phenyl]-cyclobutyl)-carbamic acid tert-butyl ester

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Reaction Steps

To a solution of {1-[4-(4-oxo-2-phenyl-4,7-dihydro-pyrano[2,3-e]indazol-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester (65 mg, 0.13 mmol) in DMF (3 mL) at 0° C. under an atmosphere of N2 was added sodium hydride (60% in mineral oil, 6 mg, 0.15 mmol). After 5 min, methyl iodide (10 μL, 0.16 mmol) was added and the mixture stirred for a further 2 hours. The reaction was quenched with H2O, partitioned between EtOAc and H2O and the phases separated. The organic extracts were washed with brine, dried (Na2SO4), filtered, and concentrated in vacuo. The resultant residue was subjected to flash chromatography (SiO2, gradient 50 to 70% ethyl acetate in cyclohexane) to afford the title compound as an oil (41 mg, 60%). LCMS (Method B): RT=4.42 min, [M+H]+=522. Also obtained was {1-[4-(8-Methyl-4-oxo-2-phenyl-4,8-dihydro-pyrano[2,3-e]indazol-3-yl)-phenyl]-cyclobutyl}-carbamic acid tert-butyl ester as a white solid (22 mg, 32%). LCMS (Method B): RT=4.26 min, [M+H]+=522.

Provenance & Evidence