Sodium Hydroxide → HCID 57826391, compound

Participants

Reaction Conditions

Reaction Steps

A solution of methyl 4-(1-methyl-1H-pyrazol-5-yl)-5-propyl-2-thiophenecarboxylate (714 mg, 2.70 mmol)[prepared in Example 112] and N-bromosuccinimide (481 mg, 2.70 mmol) in tetrahydrofuran (12 ml) was stirred in a sealed tube for 1 h at 70° C. The reaction mixture was divided and half of the solution was treated with 6N sodium hydroxide (2.251 ml, 13.51 mmol). The reaction mixture stirred at 70° C. in a sealed tube for 12 h and was partitioned between H2O-DCM. The pH of the aqueous phase was adjusted to ˜4 and washed several times with DCM. The combined organic fractions were dried over Na2SO4, concentrated and used directly affording 4-(4-bromo-1-methyl-1H-pyrazol-5-yl)-5-propyl-2-thiophenecarboxylic acid (445 mg, 1.35 mmol, 50% yield): LCMS (ES) m/e 329, 331 (M, M+2)+.

Provenance & Evidence