Maleic Anhydride → 2,4-Bis(1-n-propyl-2-methyl-3-indolyl)-4-oxobutanoic acid

Participants

Reaction Steps

A stirred solution of 20.0 g (0.204 mole) of maleic anhydride and 70.0 g (0.408 mole) of 1-n-propyl-2-methylindole in 200 ml of benzene was heated at reflux for a period of approximately eighteen hours and then allowed to cool to ambient temperature. The solid which separated from the cooled solution was collected by filtration, washed with fresh chilled benzene and dried in vacuo at 60° C. to obtain 30.0 g of 2,4-bis-(1-n-propyl-2-methyl-3-indolyl)-4-oxobutanoic acid (Formula VII: R=CH3CH2CH2 ; R1 =CH3 ; Y=H) as a white solid melting over the range 210° to 215° C.

Provenance & Evidence