Acetic Anhydride → 4-Acetoxy-3-pyridine-4-yl-4-m-tolyl-cyclopent-2-en-1-one

Participants

Reaction Steps

To a solution of 4-hydroxy-4-pyridine-4-yl-3-m-tolyl-cyclopent-2-en-1-one, and it's regioisomer 4-hydroxy-3-pyridine-4-y1-4-m-toly1-cyclopent-2-en-1-one prepared as described in Example 8, Step E (265 mg, 1.0 mmole) in methylene chloride (5 mL) was added dimethylamino pyridine (183 mg, 1.5 mmole) and acetic anhydride (0.12 mL, 1.2 mmole) at r.t. The reaction mixture was stirred at that temperature for 1 hr before quenching the reaction with 1 mL of methanol. Concentration and purification (silica, hexane/ethyl acetate) gave the title compound as the slower eluting isomer. MS (m/z): Calcd. C19H17NO3(M+): 307, found (M+H) +: 308.1.

Provenance & Evidence