Potassium Hydroxide → Tert-butyl 5-amino-3-[(3,5-dimethoxyphenyl)methoxy]pyrazole-1-carboxylate

Participants

Reaction Steps

Potassium hydroxide (11.19 g, 199.4 mmol) dissolved in water (44.8 ml) was added to a solution of 5-[(3,5-dimethoxyphenyl)methoxy]-2H-pyrazol-3-amine (7.121 g) dissolved in dichloromethane (40 ml). A solution of (2-methylpropan-2-yl)oxycarbonyl tert-butyl carbonate (6.8 g, 31.2 mmol) in DCM (35 ml) was added and the reaction mixture was stirred vigorously at room temperature for 4 h. The reaction mixture was separated and the organic layer was washed with water (2×15 ml) and brine (2×15 ml), dried over sodium sulphate, filtered, evaporated and dried in vacuo to give tert-butyl 5-amino-3-[(3,5-dimethoxyphenyl)methoxy]pyrazole-1-carboxylate (8.70 g, 99%) as a cream solid.

Provenance & Evidence