A facile synthesis of substituted pyridines and pyrazolo[3,4‐b]pyridines

A facile, solvent free, ecofriendly approach for the synthesis of 2‐amino‐3(ethylcarboxy)‐4,6‐disubsti‐tuted pyridine 4 and pyrazolo[3,4‐b]pyridines 6 is herein described employing neat reaction conditions under microwave irradiation. This solventless methodology is environmentally benign as it completely eliminates the use of solvent from the reaction procedure. The observed reaction rate enhancement and high yield of products are due to the neat reaction conditions coupled with microwaves (MWs).