CuCl-catalyzed one-pot synthesis of 5,6-dihydropyrazolo[1,5-c]quinazolines
作者:Shenghai Guo、Jiliang Wang、Yan Li、Xuesen Fan
DOI:10.1016/j.tet.2014.02.027
日期:2014.4
A simple and efficient procedure for the preparation of 5,6-dihydropyrazolo[1,5-c]quinazolines via CuCl-catalyzed tandem reaction of 5-(2-bromoaryl)-1H-pyrazoles with aldehydes and aqueous ammonia under nitrogen atmosphere has been developed. The usefulness of this novel methodology was showcased by its successful application in the preparation of a potential Eg5 inhibitor.
在氮气气氛下,通过CuCl催化5-(2-溴芳基)-1 H-吡唑与醛和氨水的串联反应,制备5,6-二氢吡唑并[1,5- c ]喹唑啉的简单有效的方法具有已开发。这种新方法的实用性在成功地制备潜在的Eg5抑制剂中得到了证明。
General and efficient copper-catalyzed aerobic oxidative synthesis of N-fused heterocycles using amino acids as the nitrogen source
作者:Qing Liu、Haijun Yang、Yuyang Jiang、Yufen Zhao、Hua Fu
DOI:10.1039/c3ra41644e
日期:——
efficient copper-catalyzed aerobic oxidative method for the synthesis of N-fused heterocycles has been developed by using readily available α-amino acids as the nitrogen source. The reactions underwent N-arylation, aerobic oxidative dehydrogenation, intramolecular cyclization and dissociation of formic acid. This method should provide a general and practical strategy for the construction of N-fused
A novel strategy for the crossdehydrogenativecoupling (CDC) of acetophenone hydrazones and aldehydes has been developed for the synthesis of highly substituted pyrazoles. This work, for the first time, uses elemental sulfur as a promoter as well as a hydrogen acceptor in effecting the Csp(3)-Csp(2) bond formation via C-H activation.
A facile and expeditious approach to substituted 1 H -pyrazoles catalyzed by iodine
作者:Hailei Zhang、Qian Wei、Guodong Zhu、Jingping Qu、Baomin Wang
DOI:10.1016/j.tetlet.2016.05.020
日期:2016.6
A facile and expeditious method for the synthesis of 1H-pyrazoles by the reaction of α,β-unsaturated aldehydes/ketones and sulfonyl hydrazide catalyzed by as low as 2 mol % I2 has been demonstrated. This synthetic system features simple operation and mild reaction conditions, and displays a broad functional group tolerance furnishing good to excellent yields.