Sodium hydride → HCID 68349180, compound

Participants

Reaction Steps

A 60% suspension of NaH in paraffin oil (192 mg, 5 mmol) was added portionwise to a solution of tert-butyl (2-(2-(diethoxyphosphoryl)acetamido)phenyl)carbamate (1.93 g, 5 mmol) in anhydrous THF (25 mL) at 0° C. The reaction mixture was stirred for 30 min before being warmed up to room temperature. 1H-pyrazole-4-carbaldehyde (400 mg, 4.16 mmol) dissolved in anhydrous THF (5 mL) was then added and the reaction mixture was stirred for 72 h under a nitrogen atmosphere. After completion of the reaction as indicated by HPLC, the mixture was diluted with EtOAc (80 mL) and quenched with a saturated NH4Cl solution (10 mL). The organic layer was separated and washed with water (40 mL) and brine (20 mL). It was dried over anhydrous Na2SO4 and the solid was filtered. The filtrate was evaporated under vacuum. The isolated crude was purified by silica gel column chromatography using a gradient of 0-100% EtOAc in hexanes to provide 986 mg of (E)-tert-butyl (2-(3-(1H-pyrazol-4-yl)acrylamido)phenyl)carbamate as a white solid. 1HNMR (300 MHz, CD3OD): δ 7.93 (broad s, 2H), 7.64 (d, 1H, J=15.6 Hz), 7.56 (d, 1H, J=7.2 Hz), 7.45 d, 1H, J=7.8 Hz), 7.11-7.24 (m, 2H), 6.59 (d, 1H, J=15.6 Hz), 1.50 (s, 9H), MS: ES+(M+Na)+: 351

Provenance & Evidence