Diethyl Oxalate → Ethyl 2-pyridineglyoxylate

Participants

Reaction Steps

A solution of n-butyllithium (100 mL, 1.6 M, 160 mmol) in hexanes was added over 2 min. to a stirred solution of 2-bromopyridine (15.0 mL, 24.9 g, 157 mmol) in 500 mL of ether cooled in a dry ice/i-PrOH bath, causing a temporary rise in temperature to 47° C. After 25 min., the solution was transferred rapidly to a stirred 0° C. solution of diethyl oxalate (75 mL, 81 g, 550 mmol) in 1000 mL of ether. After 2 h at 0° C., the mixture was washed with saturated aq. NaHCO3 (900 ml), water (900 mL), and saturated aq. NaCl (450 mL). The organic layer was dried (MgSO4), filtered, and evaporated. Distillation gave the title compound as 11.68 g of yellow liquid, B.p. 96-108° C. (0.3 mm Hg pressure). For the title compound: 1H NMR (500 MHz, CDCl3) δ 8.78 (d, J=5, 1H), 8.13 (d, J=8, 1H), 7.93 (td, J=8, 2, 1H), 7.56 (ddd, J=8, 5, 1, 11H), 4.51 (q, J=7,22H), 1.44 (t, J=7, 3H).

Provenance & Evidence