New entry to indazolo[2,3-a]quinazolines by revision of the reported structure of an indolo[1,2-b]indazole derivative
The reported structure of an indolo[1,2-b]indazole derivative is revised to a indazolo[2,3-a]quinazoline derivative based on detailed NMR analyses and chemical transformation.
Transition-metal-free N-arylation: A general approach to aza-fused poly-heteroaromatics
A new and efficient method for the synthesis of various aza-fused poly-hetero aromatics has been described. This protocol includes an intermolecular condensation followed by metal-free base-promoted intramolecular C―N coupling reaction. The advantage of this one-pot transformation lies in the use of simple cyclic amidines-like compounds without prefunctionalization of the starting heterocycles.