Sodium hydride → (S)-Ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-(3-(2-bromophenyl)prop-1-en-1-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate

Participants

Reaction Steps

To a suspension of (2-bromophenethyl)triphenylphosphonium iodide (0.121 g, 0.212 mmol) in THF (1 ml) at 0° C. was added sodium hydride (8.68 mg, 0.217 mmol) and the resulting mixture was stirred at rt for 45 min. The mixture was cooled to −78° C. and (S)-ethyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-formyl-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate (0.050 g, 0.106 mmol) dissolved in THF (1 ml) was added dropwise and the mixture was stirred at −78° C. for 1 h then warmed to room temperature and stirred 2 h. The reaction was quenched with water and the product was extracted with EtOAc. The organic phase was washed with brine, dried (Na2SO4), filtered and concentrated. The residue was purified by flash chromatography (Biotage; 0%-50% EtOAc/hexane; 20 CV) to give the title compound (0.0386 g, 0.060 mmol, 57.0% yield) as a pale yellow oil. 1H NMR (400 MHz, CDCl3) δ 7.65-7.50 (m, 1H), 7.40-7.30 (m, 1H), 7.28-7.20 (m, 1H), 7.17-7.05 (m, 1H), 6.73-6.55 (m, 1H), 6.54-6.44 (m, 1H), 6.11-5.74 (m, 3H), 5.56-4.97 (m, 2H), 4.33-4.11 (m, 4H), 4.07-3.98 (m, 1H), 3.94 (d, J=4.4 Hz, 1H), 2.62 (s, 3H), 2.01-1.79 (m, 3H), 1.77-1.64 (m, 1H), 1.29-1.19 (m, 15H), (4 piperidine protons not visible in NMR). LCMS (M+H) calcd for C33H43BrN4O4: 640.24. found: 641.4.

Provenance & Evidence