Dimethylformamide → HCID 137329844, compound

Participants

Reaction Steps

To a solution of 5-allyldimethylsilyl-2-bromopyridine (7 Scheme 27, 14.5 g, 56 mmol) in dry THF (400 mL) at −78° C. was added n-butyllithium (2.5 M in hexanes, 22.5 mL, 56 mmol) over a period of 20 min. After stirring 30 min at this temperature, anhydrous DMF (6.5 mL, 84 mmol) was added over a period of 5 min, and the reaction mixture was stirred for 30 min then warmed to room temperature. Saturated NCl (10 mL) was added to the reaction mixture. The layers were separated, and the organic layer was dried (Na2SO4), concentrated. The crude product was purified by column chromatography (1:7 ethyl acetate/hexanes) to afford an oil (4.2 g, 36%); 1H NMR (300 MHz, CDCl3) δ 0.26 (s, 6 H), 1.71 (d, J=8.40 Hz, 2 H), 4.74 (m, 1 H), 4.79 (s, 1 H), 5.62 (m, 1 H), 7.80 (d, J=7.80 Hz, 1 H), 7.89 (m, 1 H), 8.75 (d, J=0.90 Hz, 1 h), 9.97 (s, 1 H); 13C NMR (75 MHz, CDCl3) 3.65 (2C), 23.1, 114.7, 120.7, 133.3, 139.9, 142.7, 153.0, 154.5, 193.8. HRMS (EI) calcd for C11H15NOSi 205.0923, found 205.0927.

Provenance & Evidence