Synthesis of (2
<i>H</i>
)‐Indazoles from Azobenzenes Using Paraformaldehyde as a One‐Carbon Synthon
作者:Rina Chun、Saegun Kim、Sang Hoon Han、Sangil Han、Suk Hun Lee、Neeraj Kumar Mishra、Young Hoon Jung、Hyung Sik Kim、In Su Kim
DOI:10.1002/adsc.201801547
日期:2019.4
hydroxymethylation followed by intramolecular annulation of azobenzenesusingparaformaldehyde as a valuable C1‐feedstock is described. The method is readily extended to the coupling reaction between azobenzenes and trifluoroacetaldehyde. This transformation efficiently produces a range of C3‐unsubstituted and C3‐trifluoromethylated (2H)‐indazoles, which are important targets in the development of novel