The synthesis of<i>n</i>-substituted isothiazol-3(2<i>h</i>)-ones from<i>n</i>substituted 3-benzoylpropionamides
作者:Stylianos Hamilakis、Demetrios Kontonassios、Athanase Tsolomitis
DOI:10.1002/jhet.5570390122
日期:2002.1
N-Substituted isothiazol-3(2H)-ones can be easily prepared from N-substituted 3-benzoylpropi-onamides in two experimentally simple steps, in satisfactory overall yields. Reaction of the amides with excess thionyl chloride results in the formation of N-substituted 5-benzoylisothiazol-3(2H)-ones, which are readily debenzoylated with alkali to the corresponding N-substituted isothiazol-3(2H)-ones. This
N-取代的异噻唑-3(2H)-可以容易地由N-取代的3-苯甲酰基丙酰胺在两个实验上简单的步骤中以令人满意的总产率制备。在形成过量的亚硫酰氯的结果酰胺的反应Ñ取代5- benzoylisothiazol-3(2 ħ) -酮,其可容易地用碱debenzoylated到相应Ñ取代异噻唑-3-(2 ħ) -酮。该方法现已成功地用于合成被大烷基(例如叔酸)N-取代的异噻唑酮-丁基,并带有带有强吸电子取代基的苯基,例如3-硝基苯基和4-硝基苯基,或带有释放电子的取代基,例如4-甲基苯基和4-甲氧基苯基。