Acetic Acid → 5-(p-Cyanophenyl)-5-ethoxycarbonyl-5,6,7,8-tetrahydroimidazo[1,5-a]pyridine

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Reaction Steps

A solution of 8.1 g of 5-(3-chloropropyl)-1-(α-ethoxycarbonyl-p-cyanobenzyl)-1H-imidazole in 50 ml of tetrahydrofuran is cooled to 0° in an ice bath. To this is added 8.0 g of potassium-t-butoxide as a solid in portions. The mixture is stirred at room temperature for 2 h, neutralized with 10% acetic acid and partitioned between methylene chloride and water. The organic layer is washed with water, dried over magnesium sulfate and evaporated to yield an oil which is dissolved in a small volume of acetone and neutralized with ethereal hydrogen chloride. The solid is collected to yield 5-(p-cyanophenyl)-5-ethoxycarbonyl-5,6,7,8-tetrahydroimidazo[1,5-a]-pyridine.

Provenance & Evidence