Reaction Steps
To a solution of (S)-methyl 2-(7-(4-(allyloxy)-4-methylpiperidin-1-yl)-2-(5′-fluoro-2′-hydroxy-[1,1′-biphenyl]-3-yl)-5-methylpyrazolo[1,5-a]pyrimidin-6-yl)-2-(tert-butoxy)acetate (0.19 g, 0.31 mmol, 1 equiv), (R)-pent-4-en-2-ol (0.095 mL, 0.92 mmol, 3 equiv), and PPh3 (0.16 g, 0.62 mmol, 2 equiv) in THF (1.54 mL) was added DEAD (0.098 mL, 0.62 mmol, 2 equiv). After stirring 2 h, dilute with ether and wash with water. The ether layer was dried (MgSO4) and concentrated in vacuo. The crude product was purified by flash column chromatography (0-60% EtOAc in hexane) to provide the product as a white foam (0.17 g, 81%). 1H NMR (500 MHz, CDCl3) [note: 4H of piperidine not observed and are likely very broad] δ 8.16 (s, 1H), 8.08-7.99 (m, 1H), 7.61-7.56 (m, 1H), 7.51 (d, J=7.6 Hz, 1H), 7.16 (dd, J=9.1, 2.8 Hz, 1H), 7.04-6.95 (m, 2H), 6.92-6.82 (m, 1H), 6.08-5.97 (m, 1H), 5.74 (s, 1H), 5.42 (d, J=17.3 Hz, 1H), 5.22-5.08 (m, 2H), 5.06-4.99 (m, 2H), 4.27 (d, J=6.0 Hz, 1H), 4.03 (d, J=4.7 Hz, 2H), 3.77 (s, 3H), 2.65 (br. s., 3H), 2.45-2.35 (m, 1H), 2.28 (s, 1H), 2.06-1.95 (m, 3H), 1.79-1.69 (m, 1H), 1.38 (br. s., 3H), 1.27 (s, 9H), 1.21 (d, J=6.0 Hz, 3H). LCMS (M+1)=685.4.
