Potassium Hydroxide → 3-bromo-2-methyl-5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole

Participants

Reaction Steps

To a solution of 4-bromo-5-(3-chloro-propyl)-3-methyl-1H-pyrazole (2.42 g, 10.2 mmol) in isopropyl alcohol (35 mL) was added KOH (0.86 g, 15.3 mmol) dissolved in water (7 mL). The reaction was heated to reflux for 4 h. After cooling the reaction was partially concentrated, diluted with EtOAc and washed with brine. The organic layer was dried over Na2SO4, filtered and concentrated to give a light yellow oil as the desired product (1.01 g, 5.0 mmol). MS m/z 203.4 (M+H)+.

Provenance & Evidence