作者:Hidetsura Cho、Eunsang Kwon、Yoshizumi Yasui、Satoshi Kobayashi、Shin-ichiro Yoshida、Yoshio Nishimura、Masahiko Yamaguchi
DOI:10.1016/j.tetlet.2011.10.130
日期:2011.12
4)-dihydropyrimidine with the same amines gave conventional substituted products at position 2. The effect of this ring opening was found to be due to the electron density of the benzene ring of a nucleophilic amine. On the other hand, aralkylamines, alkylamines, or heterocyclic amines did not cleave the skeleton. The ring-opening chemical structure was confirmed by X-ray crystallographic analysis. This characteristically
据报道,在0.1存在下,亲核加成4,6-未取代的1,4-二氢嘧啶与3当量的苯胺衍生物或苯肼后,首次观察到了1,4-二氢嘧啶骨架的位置1和2之间的环断裂。对甲苯磺酸吡啶鎓盐(PPTS)在CH 2 Cl 2中的当量; 4-甲基-6-未取代的1,6(3,4)-二氢嘧啶与相同的胺的亲核反应在位置2产生常规取代的产物。发现这种开环的作用是由于氢的电子密度。亲核胺的苯环。另一方面,芳烷基胺,烷基胺或杂环胺不裂解骨架。通过X射线晶体学分析确认开环化学结构。这种特征上不同的现象可能是由于1,4-DP和1,6(3,4)-DP的两个C C双键的模式以及DP环上两个取代基的作用所致。