Acetic Anhydride → tert-Butyl-7-acetoxy-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate

Participants

Reaction Steps

A solution of tert-butyl 7-hydroxy-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate (step 4) (500 mg, 1.159 mmol) in pyridine (3 ml) was treated slowly with acetic anhydride (0.219 ml, 2.317 mmol) and the resulting yellow solution was stirred at room temperature overnight. The reaction mixture was evaporated to dryness and purification of the crude material by chromatography on silica eluting with 0-60% EtOAc in iso-hexane afforded the titled compound;

Provenance & Evidence