Structures of Three 1-Benzazepine-2,5-diones: Cyclic Derivatives of N-Acyl Kynurenines.

2-Amino-N-(2,3,4,5-tetrahydro-2,5-dioxo1H-l-benzazepin-3-yl)benzamide (III): C I7HI5N303, Mr = 309.3, triclinic, P i (confirmed on refinement), a =4.897(2), b=11 .426(4) , c=14-315 (7) /~, a = 76"30 (4), /3 = 81"99 (4), y = 78-57 (3) °, V = 759.2 (6)/~3, Din(flotation) = 1.34 (1), Dx = 1.353 Mg m -3, Z = 2, F(000) = 318, a(Cu Ka) = 1.5418/~, /z = 0-65 m m 1. Final R = 0.068 for 1415 observed data. 3-Chloro-N-(2,3,4,5-tetrahydro-2,5dioxo1 H1-benzazepin-3-yl)benzamide (IV): C I7H13CIN203, Mr=328"8, monoclinic, P2~/n, a= 4.871 (1), b = 11-676(1), c=25-875 (4) A, 13 = 90.34 (1) °, V = 1471.6 (3) ,3,3, Dm(flotation) = 1-48 (1), Dx = 1.484 Mg m -3, Z = 4, F(000) = 680, A(Cu Ka) = 1"5418 A, /x = 2.33 mm -1. Final R = 0.042 for 2011 observed terms. N-(2,3,4,5-Tetrahydro-2, 5-dioxo1 H1 -benzazepin-3-yl)-2-naphthalenecarboxamide (V): C21H16N203, Mr = 344.4,