Pyridine → HCID 10203446, compound

Participants

Reaction Steps

To dimethylformamide (0.2 mL, 2.6 mmol) in CH3CN (20 mL) at 0° C. was added oxalyl chloride (0.23 mL, 2.6 mmol) and the reaction was stirred 0.5 h. The amide from Example 27 was added and the reaction was stirred cold 0.5 h. Pyridine (0.37 mL, 4.6 mmol) was added and the reaction was allowed to warm to rt and stirred for 24 h. The solvent was stripped, the residue was partitioned between CH2Cl2 and 1N HCl, and the layers separated. The aqueous layer was basified with 1N NaOH and extracted with EtOAc. The organic layers were combined and dried (MgSO4). Purification by chromatography on silica gel using 3% MeOH in CH2Cl2 and recrystallization from CH2Cl2/hexanes afforded 117 mg (89%); 1H NMR (CDCl3) δ 7.50 (d, j=8.8 Hz, 2H), 7.44 (m, 5H), 7.31 (m, 1H), 6.97 (d, j=9.2 Hz, 2H), 6.71 (d, j=9.5 Hz, 2H), 6.28 (m, 1H), 4.24 (t, j=6.6 Hz, 2H), 3.85 (s, 3H), 3.24 (t, j=6.6 Hz, 2H) ppm; LRMS (M+H)+ 438.4.

Provenance & Evidence