Synthesis and Structure of 3,4-Dihydropyrido[2′,3′:3,4]pyrazolo[1,5-<i>a</i>][1,3,5]triazin-2-amines
作者:Anton V. Dolzhenko、Shiqi Bai、Anna V. Dolzhenko、Wai Keung Chui
DOI:10.1002/jhet.851
日期:2012.7
A new convenient synthon for heterocyclic chemistry, namely 1H‐pyrazolo[3,4‐b]pyridin‐3‐ylguanidine was successfully prepared by selective guanylation of 1H‐pyrazolo[3,4‐b]pyridin‐3‐amine. A series of 3,4‐dihydropyrido[2′,3′:3,4]pyrazolo[1,5‐a][1,3,5]triazin‐2‐amines was synthesized from 1H‐pyrazolo[3,4‐b]pyridin‐3‐ylguanidine using aldehydes or ketones as one‐carbon inserting reagents. The tautomeric
对于杂环化学的新合成子方便,即1 ħ -吡唑并[3,4- b是否已成功的1选择性脒制备]吡啶-3- ylguanidine ħ -吡唑并[3,4- b ]吡啶-3-胺。由1 H-吡唑并[3,4]合成了一系列3,4-二氢吡啶并[2',3':3,4]吡唑并[1,5- a ] [1,3,5]三嗪-2-胺- b ]使用的醛或酮为一碳插入试剂吡啶-3- ylguanidine。使用光谱学(例如2D NOESY NMR)和单晶X射线衍射数据确定产物的互变异构偏好。