Synthesis of Pyrazolo[1,2-<i>a</i>]cinnolines<i>via</i>a Rhodium-Catalyzed Oxidative Coupling Approach
作者:Li Xing、Zhoulong Fan、Chengyu Hou、Guoping Yong、Ao Zhang
DOI:10.1002/adsc.201301009
日期:2014.3.24
An efficient synthetic strategy for the unique class of pyrazolo[1,2‐a]cinnolines was developed through a rhodium‐catalyzed oxidative coupling of N‐aryl‐1H‐pyrazol‐5(4H)‐ones with internal alkynes. This protocol features use of the pyrazolone function in the substrate as an intrinsic directing group, hexafluoroisopropyl alcohol (HFIP) as the solvent, and mild reaction conditions as well as a wide substrate
为唯一的类
吡唑并的有效的合成策略[1,2一]噌啉通过的
铑催化的氧化偶合开发ñ -芳基- 1 H ^ -
吡唑-5-(4 ħ) -酮与内部
炔烃。该方案的特征是在底物中使用
吡唑啉酮功能作为固有的导向基团,在溶剂中使用
六氟异丙醇(HFIP),反应条件温和,并且底物范围广。