The reaction of 4-amino-3-aryl-5-benzylaminopyrazoles (la,b) with 3dimethylaminopropiophenones (2) in ethanol with acetic acid gave l-benzyl-4,6-diaryl-2,3dihydropyrazolo [3,4-b][l,4]diazepines (3a-h).The structure elucidation of the products is based on detailed nmr analysis ('H, 13 C and DEPT).Vol. 6, No. 3, 2000 Synthesis of new l-benzyl-4,6-diaryl-2,3-dihydropyrazolo[3,4-b][l,4]-diazepenes