Synthesis of pyrazolo[3,4-b]pyrrolo[3,4-d]pyridine derivatives via Aza-Diels–Alder reaction: evaluation of torsion effect of pyrazoylimines
作者:Li-Ya Wang、Naoto Uramaru、Fung Fuh Wong
DOI:10.1016/j.tet.2014.08.013
日期:2014.10
A modified method for the synthesis of pyrazolo[3,4-b]pyrrolo[3,4-d]pyridine was developed through an Aza-Diels–Alder reaction of pyrazoylimines with maleimides in the sealed tube. Based on the control experiment, the yields for the Aza-Diels–Alder reaction seemed proportional to the suitable torsion conformation of pyrazoylimine, which was modulated by N,N-disubstituted amidinyl moiety. The versatile
通过在密封管中吡唑并嘧啶类与马来酰亚胺的Aza-Diels-Alder反应,开发了一种改良的吡唑并[3,4- b ]吡咯并[3,4- d ]吡啶的合成方法。根据对照实验,Aza-Diels-Alder反应的收率似乎与吡唑基嘧啶的合适扭转构象成比例,该构象受N,N-二取代的mid基部分调节。还证实了通用密封管技术可提高Aza-Diels-Alder反应的更高分离产率。