作者:Danielle J. Vugts、Manoe M. Koningstein、Rob F. Schmitz、Frans J. J. de Kanter、Marinus B. Groen、Romano V. A. Orru
DOI:10.1002/chem.200600168
日期:2006.9.18
been observed. Furthermore, the multicomponent reaction seems to be restricted to the use of isocyanates with strongly electron-withdrawing substituents, but an interesting additional exchange reaction under microwave conditions leads to dihydropyrimidines with less electron-withdrawing substituents at N3. In addition, a diastereoselective formation of dihydropyrimidines has been observed when using a
通过使用膦酸酯,腈,醛和异(硫)氰酸酯之间的四组分反应,可以有效地制备各种不同取代的二氢嘧啶和噻嗪。充分描述了该多组分反应的范围和局限性。已经研究了所有四个组件的变化。腈和醛的输入量可以广泛变化,但是膦酸酯输入量的变化仍然有限。已经观察到有趣的重排导致氨基磷酸酯。此外,多组分反应似乎仅限于使用具有强吸电子取代基的异氰酸酯,但是在微波条件下有趣的附加交换反应会导致二氢嘧啶在N3处具有吸电子取代基较少。此外,当使用手性醛作为输入时,已经观察到二氢嘧啶的非对映选择性形成。最后,通过将异氰酸酯组分改变为异硫氰酸酯,可以有效地形成噻嗪,而不是相应的硫代-二氢嘧啶。