Piperazine → 5,7-Dimethyl-2-(1-piperazinyl)benzoxazole

Participants

Reaction Steps

A 50 mg-portion of 5,7-dimethyl-2-mercaptobenzoxazole was dissolved in 5 ml of nitromethane, and the solution was mixed with 240 mg of piperazine and heated under reflux for 12 hours. The solvent was concentrated under a reduced pressure, and the residual oily matter was mixed with saturated sodium bicarbonate aqueous solution and extracted with ethyl acetate. The organic layer was washed with saturated brine and dried with magnesium sulfate, and then the solvent was evaporated under a reduced pressure. Thereafter, the thus obtained mixture was purified by a silica gel column chromatography (chloroform:methanol=20:1) to obtain the title compound (35 mg) in white color.

Provenance & Evidence