C-乙氧基羰基N-芳基nitrilimines的环加成和它们的C-乙酰类似物4到α,β-不饱和的酮,得到主要的5-酰基-4-芳基-2-吡唑啉衍生物和分别。所述cycloadducts的结构和通过光谱(支持的13 C NMR,1 H NMR和IR)和分析数据。Tewari和Parihar关于这些反应的区域化学的结论无法维持。
C-乙氧基羰基N-芳基nitrilimines的环加成和它们的C-乙酰类似物4到α,β-不饱和的酮,得到主要的5-酰基-4-芳基-2-吡唑啉衍生物和分别。所述cycloadducts的结构和通过光谱(支持的13 C NMR,1 H NMR和IR)和分析数据。Tewari和Parihar关于这些反应的区域化学的结论无法维持。
In Situ Generation of Nitrilimines from Aryldiazonium Salts and Diazo Esters: Synthesis of Fully Substituted Pyrazoles under Room Temperature
作者:Ying Shao、Hao Zheng、Junfeng Qian、Xiaobing Wan
DOI:10.1021/acs.orglett.8b00750
日期:2018.4.20
A novel one-pot synthesis for fully substituted pyrazoles has been well developed via the in situ generation of nitrilimines from aryldiazonium salts and diazo esters and a subsequent cycloaddition with 1,3-dicarbonylcompounds. High yields, mild conditions, wide substrate scope, and operational simplicity are the significant advantages of this methodology.