X-RAY STRUCTURAL-ANALYSIS OF ETHYL AZOLIN-2-YL)-4H-1,4-BENZOXAZIN-3-ONE-4-YL]BUTYRATE

With the aim of discovering new molecules with K+ channel modulating p roperties, we have synthesized analogues of cromakalim, an important m olecule which shows specific affinity toward the K+ channels, by repla cing the benzopyrane ring with a benzoxazine moiety. As a part of this study, we have synthesized and characterized, in solution and in the solid state as well, the compound ethyl azolin-2-yl)-4H-1,4-benzoxazin -3-one-4-yl]butyrate (V). This compound exhibits in the solid state th e following parameters: molecular formula C19H24N2O4S, triclinic, spac e group P (1) over bar, M-w = 376.5, a = 12.581(3) Angstrom, b = 5.385 (4) Angstrom, c = 14.612(2) Angstrom, alpha = 91.85(2), beta = 108.9(3 ), gamma = 82.04(4), V = 944.7 Angstrom(3), Z = 2, d = 1.323 g.cm(-3). We describe here the synthesis and discuss the solid-state conformati on of this new molecule; when tested on rat aorta ring precontracted w ith phenylephrine, the compound showed a concentration-dependent relax ation comparable to that measured for cromakalin taken as reference dr ug.