Regioselective synthesis of 1,5-diarylpyrazole derivatives from hex-1-en-3-uloses
作者:Po-Yen Chen、Wei-Tsung Huang、Min-Tsang Hsieh、Chih-Shiang Chang、Hui-Chang Lin
DOI:10.1016/j.tet.2022.133070
日期:2022.11
1,5-diarylpyrazoles were synthesized by a two-step procedure starting from hex-1-en-3-uloses. The initial microwave-assisted oxidative Heck type C-glycosylation of hex-1-en-3-uloses with arylboronic acids in the presence of Pd(OAc)2 and DDQ afforded C-1 aryl enones. The resulting product further reacted with arylhydrazines in the presence of InCl3 and oxygen to give the 1,5-diarylpyrazoles in moderate
1,5-二芳基吡唑是通过从 hex-1-en-3-uloses 开始的两步程序合成的。在 Pd(OAc) 2和 DDQ存在下,hex-1-en-3-uloses 与芳基硼酸的初始微波辅助氧化 Heck 型 C-糖基化得到C -1 芳基烯酮。所得产物在 InCl 3和氧气存在下进一步与芳基肼反应,得到 1,5-二芳基吡唑,产率中等至高(51-83%)。