Cu-Catalyzed Aminoacyloxylation of Unactivated Alkenes of Unsaturated Hydrazones with Manifold Carboxylic Acids toward Ester-Functionalized Pyrazolines
作者:Rui-Hua Liu、Zi-Qing Wang、Bang-Yi Wei、Jian-Wu Zhang、Bo Zhou、Bing Han
DOI:10.1021/acs.orglett.8b01507
日期:2018.7.20
A copper-catalyzed aminoacyloxylation of unactivated alkenes of unsaturated hydrazones is achieved by using various commercially available carboxylic acids as the acyloxylating reagents and di-tert-butylperoxide (DTBP) as the oxidant. By using this method, a sequence of structurally diversiform acyloxyl-substituted pyrazolines are efficiently synthesized. Significantly, many carboxyl-containing drugs
Metal-free cyclization of unsaturated hydrazones for the divergent assembly of pyrazolones and pyrazolines
作者:Xiaobing Liu、Yao Zhou、Qiuling Song
DOI:10.1039/c9cc04039k
日期:——
An oxidative cyclization of β,γ-unsaturatedhydrazones for the divergent assembly of pyrazolones and pyrazolines under metal-free conditions is presented. This divergent synthetic strategy was achieved by controlling the reaction atmosphere. A number of pyrazolines were obtained via 5-exo-trig cyclization when the reaction was performed under N2. Whereas when the reaction was conducted under O2, diverse