Acetic Acid → HCID 68312525, compound

Participants

Reaction Steps

To a solution of 6-phenylpicolinaldehyde (Tetrahedron Lett. 2010, 51, 5621-5623; 0.391 g, 2.133 mmol) in methanol (4 mL) at ambient temperature was added D-valinol (0.22 mL, 1.9 mmol) followed by acetic acid (0.4 mL, 8 mmol). After 5 min, MP-cyanoborohydride (2.5 mmol/g, 500 mg) was added and stirring continued overnight. The mixture was filtered and the filtrate partitioned between 1N NaOH and CH2Cl2. The organic phase extracted with 1N aqueous HCl. The organic layer was discarded and the aqueous phase was made basic with 1N NaOH and extracted with EtOAc. The organic extract dried, filtered and concentrated to provide 300 mg (57%) of the title compound. MS (DCI30 ) m/z 271 (M+H); 1H NMR (300 MHz, CDCl3) δ 8.04-7.93 (m, 2H), 7.73 (t, J=7.7 Hz, 1H), 7.62 (d, J=7.6 Hz, 1H), 7.53-7.35 (m, 3H), 7.21 (d, J=7.5 Hz, 1H), 4.06 (s, 2H), 3.72 (dd, J=11.0, 4.0 Hz, 1H), 3.52 (dd, J=11.0, 6.9 Hz, 1H), 2.55 (td, J=6.7, 4.0 Hz, 1H), 1.91 (td, J=13.6, 6.8 Hz, 1H), 1.05 (d, J=6.4 Hz, 3H), 0.96 (d, J=6.8 Hz, 3H).

Provenance & Evidence