Reactions of 5-methyl-2H-1, 4-thiazin-3 (4H) -one (4) with various N-acylpyridinium salts (7a-g) led to (N-acyldihydropyridyl) thiazinones (5a-g), oxidation of which yielded a new class of pyridylthiazinones (6a-g). These reactions were applied to the synthesis of other azaarylthiazinones. Some of these azaarylthiazinones, particularly 6- (4-pyridyl) thiazinones (6a, 14a and 14b) showed positive inotropic activity with little chronotropic effect on guinea pig left atria.
                                    5-甲基-2H-1,4-
噻嗪-3(4H)-酮(4)与各种N-酰基
吡啶盐(7a-g)反应得到(N-酰基
二氢吡啶基)
噻嗪酮(5a-g),将其氧化得到一类新的
吡啶基
噻嗪酮(6a-g)。这些反应被应用于其他含氮芳基
噻嗪酮的合成。其中一些含氮芳基
噻嗪酮,特别是6-(4-
吡啶基)
噻嗪酮(6a, 14a和14b),显示出了对豚鼠左心房有正性肌力作用和较小的变时效应。