Butylamine → HCID 59750472, compound

Participants

Reaction Conditions

Reaction Steps

N,N′-carbonyldiimidazole (570 mg, 3.5 mmol) was added to a mixture of 4-oxo-2-(2-pyridyl)-4H-1,3-benzothiazine-7-carboxylic acid (800 mg, 2.8 mmol) and tetrahydrofuran (20 ml), and the mixture was stirred at 60° C. for 2 hrs. Successively, butylamine (410 mg, 5.6 mmol) was added to the reaction mixture, and the mixture was stirred at 60° C. for 30 minutes. The solvent was evaporated, and the residue was subjected to a silica gel column chromatography. The fractions eluted with hexane-ethyl acetate (1:3, v/v) were collected, concentrated and recrystallized from hexane-tetrahydrofuran to give the titled compound (478 mg, 50%) as white crystals.

Provenance & Evidence