Antiallergic cinnamoyl-anthranilic acid ester(s) - prepd. by reacting cinnamic acid with o-isocyanato benzoic acid ester and hydrolysing prod.

摘要

The esters of formula (I), in which R1 R2 and R3 are H, Cl, F or Br, are made by reacting a cinnamic acid of formula (II) with an ester of o-isocyanato benzoic acid, in organic solvent at 75-130 deg. C, and subsequently hydrolysing the prod..