protic and aprotic solvents exist preferentially as 4-sulfanyl-6-oxo tautomers, and they undergo almost complete ionization in neutral aqueous, alcoholic, and aqueous-alcoholic media (pK a = 4.3). Reactions of 4-sulfanyl-2-phenyl-6H-1,3-thiazin-6-one with ammonia, amines, and difunctional N-centered nucleophiles involve cleavage of the C6-S bond in the thiazine ring and subsequent recyclization of linear
的2-芳基-4-
氯-6-反应ħ -
1,3-噻嗪-6-酮在含
水醇
硫化
钠在18-20℃下导致的容易分离的混合物的形成2-芳基-4-
硫烷基-6 H -
1,3-噻嗪-6-一钠盐(收率> 70%)和双(2-芳基-6-氧代-6 H -
1,3-噻嗪-4-基)
硫化物(<10 %)。后者也可以以50%以上的产率进行处理的2-芳基-4-硫烷基-6-获得ħ -1,3-噻嗪-6-酮的钠盐与2-芳基-4-氯-6- ħ -1 ,3-噻嗪-6-一。无论烷基化剂,溶剂,温度,反应物浓度及其比例如何,将2-芳基-4-硫烷基-6 H -1,3-噻嗪-6-进行甲基化可得到相应的甲基硫烷基衍生物(收率> 90%)。2-芳基-4-
硫烷基-6处于结晶状态的H -
1,3-噻嗪-6-在极性和非极性质子和非质子溶剂中优先存在,以4-
硫烷基-6-氧代互变异构体的形式存在,它们在中性
水溶液,
酒精,和含
水酒精介质(p K a = 4.3)。4-
硫烷基-2-苯基-6