An Improved Synthesis of Polyfunctional Acyl Azides in PEG 400
作者:Khalid Widyan
DOI:10.1080/00304948.2020.1862029
日期:2021.3.4
(2021). An Improved Synthesis of Polyfunctional Acyl Azides in PEG 400. Organic Preparations and Procedures International: Vol. 53, No. 2, pp. 120-126.
An efficient one-pot synthesis of N,N′-disubstituted ureas and carbamates from N-acylbenzotriazoles
作者:Anoop S. Singh、Dhananjay Kumar、Nidhi Mishra、Vinod K. Tiwari
DOI:10.1039/c6ra14131e
日期:——
A facile and high-yielding one-pot synthesis of carbamates and N,N'-disubstituted symmetrical ureas from N-acylbenzotriazoles has been devised. It is believed that, the intermediate acyl-azide undergo Curtius rearrangement and under different...
Exploiting the Imidazolium Effect in Base-free Ammonium Enolate Generation: Synthetic and Mechanistic Studies
作者:Claire M. Young、Daniel G. Stark、Thomas H. West、James E. Taylor、Andrew D. Smith
DOI:10.1002/anie.201608046
日期:2016.11.7
function as ammonium enolate precursors in the absence of base. Enantioselective Michael addition–cyclization reactions using different α,β‐unsaturated Michael acceptors have been performed to form dihydropyranones and dihydropyridinones with high stereoselectivity. Detailed mechanistic studies using RPKA have revealed the importance of the “imidazolium” effect in ammonium enolateformation and have highlighted
Synthesis and Structure−Activity Relationship Studies of Cytotoxic Ester and Ether Anhydrovinblastine Derivatives
作者:Han-Kun Zhang、Yong Shao、Hong Ding、Li-Hong Hu
DOI:10.1021/np800284h
日期:2008.10.24
activities against human non-small-cell lung cancer (A549) and cervical epithelial adenocarcinoma (HeLa) cell lines. Ester anhydrovinblastine derivatives exhibited potent cytotoxicity, whereas the ether analogues were much less active. The size of the introduced substituents was the foremost factor in determining the resultant cytotoxic activity. Compound 12b showed a similar cytotoxic potency to the
Cu-catalyzed arylation of 1-acyl-1H-1,2,3-Benzotriazoles via C–N activation
作者:Wenying Zhang、Yangyang Wang、Xiangru Jia、Zhengyin Du、Ying Fu
DOI:10.1016/j.jorganchem.2019.05.013
日期:2019.9
An efficient copper-catalyzed arylationreaction of 1-acyl-1H-1,2,3-benzotriazoles with diaryliodonium salts via C–N activation is explored. The reaction is conducted regioselectively to form 1-aryl-1H-1,2,3-benzotriazoles in MeCN at 80 °C in the presence of cesium carbonate. 29 examples are given with the product yield of up to 84%. The probable reaction mechanism is proposed.
通过CN活化研究了1-酰基-1 H -1,2,3-苯并三唑与二芳基碘鎓盐的有效铜催化芳基化反应。在碳酸铯存在下,于80℃在MeCN中区域选择性地进行反应以形成1-芳基-1 H -1,2,3-苯并三唑。给出了29个实例,产品收率高达84%。提出了可能的反应机理。