Selective N1-Acylation of Indazoles with Acid Anhydrides Using an Electrochemical Approach
作者:D. M. M. Mevan Dissanayake、Aaron K. Vannucci
DOI:10.1021/acs.orglett.8b03683
日期:2019.1.18
An electrochemical synthesis method for the selective N1-acylation of indazoles has been developed. This “anion pool” approach electrochemically reduces indazole molecules generating indazole anions and H2. Acidanhydrides are then introduced to the solution resulting in selective acylation of the N1-position of the indazoles. This procedure can also be applied to the acylation of benzimidazoles and indoles
The need for an operationally straightforward application of radical chemistry has led researchers to explore practical strategies to obtain and trap radicals. Herein, we report a mechanoradical generation method by direct C–N bond breaking of aryldiazonium salts using NaCl as an activator. This method opens a new pathway to radicalreactions ranging from (hetero)arylation, cascade addition, and hydrogen
A new synthesis of ethynyldimethoxytriazine 1, an important platform-compound for developing new chemical entities for anticancer research and for other biological applications, is described. Compound 1 was further reacted with azides 5a–i to provide triazin–triazoles 2a–i, which were tested on human farnesyltransferase and on the NCI-60 human tumor cell lines. Synthesis of other dimethoxytriazine derivatives 15 and 16, linked to a sp 2 or a sp 3 carbon atom were also studied.