p-Toluenesulfonic acid → (+/-) trans 1-(3,4-Dichloroanilino)-2-ethoxycarbonylaminoindane

Participants

Reaction Conditions

Reaction Steps

A solution of (±) cis-2-ethoxy-3a,8b-dihydro-4H-indeno[2,1-d]oxazole (1.0 g, 0.005 mol) in dry toluene (20 ml) was treated with 3,4-dichloroaniline (0.81 g, 0.005 mol) and a catalytic amount of p-toluenesulfonic acid (5 ml of an anhydrous 0.1M solution of p-toluenesulfonic acid in benzene). The mixture was heated under nitrogen at 60° C. for 3 h. The reaction was worked up as described in Preparation 5. Purification on a silica gel column using 1% ethanol in chloroform as eluant afforded the title compound as a solid (1.33 g).

Provenance & Evidence