Abstract
A new tetracyclic compound, 1,9-dimethyl-4,5-dihydro-6H-pyrido[3’,2’:4,5]thieno[2,3-f]pyrrolo[l,2-a][1,4]diazepin-6-one (2) was isolated and studied by X-ray crystallography. Compound 2 crystallizes in the orthorhombic system, space group Pna21, a = 11.1098(8) A, b = 8.4815(6) A, c = 28.367(2) A, V= 2673.0(3) A3, Z=8. The crystal structure comprises two crystallographically independent molecules of the compound. They relate as stereoisomers; in each the diazepine ring exhibits a boat conformation. The crystal packing reveals zigzag H-bonded chains with two distinct hydrogen bonds. The H…O distances and N-H…O angles for N3-H3…O1’ are 2.012A and 174°, and for N3’-H3’…O1 are 1.974A and 154°, respectively.
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