One-Pot Reactions of <i>N</i>-(Mesyloxy)phthalimides with Secondary Amines to 2-Ureidobenzamides, 2-Ureidobenzoic Acids, Ethyl 2-Ureidobenzoates, or Isatoic Anhydrides
作者:Michael Gütschow
DOI:10.1021/jo9900634
日期:1999.7.1
The reaction of N-(mesyloxy)phthalimides with secondary amines was examined. Transformations are accomplished by one-pot reactions to optionally afford corresponding 2-ureidobenzamides, 2-ureidobenzoic acids, ethyl 2-ureidobenzoates, or isatoic anhydrides, respectively. The mechanism of the acid-catalyzed hydrolysis (or alcoholysis) of intermediate 2-ureidobenzamides to 2-ureidobenzoic acids (or esters)
研究了 N-(甲磺酰氧基)邻苯二甲酰亚胺与仲胺的反应。转化通过一锅反应完成,以任选地分别提供相应的 2-脲基苯甲酰胺、2-脲基苯甲酸、2-脲基苯甲酸乙酯或靛红酸酐。讨论了中间体 2-脲基苯甲酰胺酸催化水解(或醇解)为 2-脲基苯甲酸(或酯)的机理。提出了涉及脲基部分作为内部酸催化剂的质子转移机制。中间体 2-脲基苯甲酸进一步转化为靛红酸酐。证明了利用所获得的 2-ureidobenzamides、2-ureidobenzoic 酸和 2-ureidobenzoate 来制备 3,1-benzoxazin-4-ones。