“double-activation” mechanism for macrolide ring closure from relatively electron-rich 2-pyridyl thiolesters while a change of mechanism is observed for electron-poor 2-pyridyl thiolesters. Mechanistic and synthetic aspects of the ion-assisted cyclization are also discussed.
动力学研究证实了“双激活”机制从相对富电子的
2-吡啶基硫代大分子封闭大环内
酯环的想法,而观察到贫电子的
2-吡啶基硫代大分子的机制发生了变化。还讨论了离子辅助环化的机理和合成方面。