Methanol → Ethyl 4-ethoxy-1-(4-fluorophenyl)pyrazole-3-carboxylate

Participants

Reaction Steps

To a mixture of D1 (9.6 g, 38 mmol, 1.0 eq.) and K2CO3 (6.8 g, 50 mmol, 1.3 eq.) in dry DMF (100 mL) was added at RT iodoethane (4.0 mL, 7.8 g, 50 mmol, 1.3 eq.). After stirring for 72 h at RT the mixture was cooled to 0° C. MeOH (5 mL) was added, the mixture was diluted with DCM (200 mL) and washed with water and phosphate buffer. The organic layer was dried over Na2SO4 and concentrated under reduced pressure to give the product D2 as a brown solid which was used without further purification in the subsequent step. MS (ES) C14H15FN2O3 requires: 278. Found: 279 (M+H)+.

Provenance & Evidence