Methyl iodide → (3-methylbenzoimidazol-4-yl)-(1-methyl-1H-spiro[chromeno[4,3-c]pyrazole-4,4'-piperidine]-1'-yl)methanone

Participants

Reaction Conditions

Reaction Steps

To a solution of (1H-benzo[d]imidazol-4-yl)(1-methyl-1H-spiro[chromeno[4,3-c]pyrazole-4,4′-piperidine]-1′-yl)methanone (21 mg, 0.052 mmol) in dry THF (0.2 mL) under N2 was added NaH (1.9 mg, 0.079 mmol) at 0° C. After 30 min, MeI (3.3 μL, 0.052 mmol) was added and the mixture was stirred at 0° C. for 1 h. The reaction mixture was quenched with water and the solvent removed under vacuum to yield a crude residue that was taken up in methanol and purified by reverse phase HPLC to give (3-methylbenzoimidazol-4-yl)-(1-methyl-1H-spiro[chromeno[4,3-c]pyrazole-4,4′-piperidine]-1′-yl)methanone. ESI-MS m/z calc. 413.5. found 414.5 (M+1)+. Retention time: 1.13 minutes (3 min run).

Provenance & Evidence