This technology is a synthesis method for obtaining quinolines by dehydrogenating 1,2,3,4-tetrahydroquinoline derivatives using dialkyl azodicarboxylates such as BTAD or DEAD. The reaction proceeds in a solution containing chloroform or deuterated chloroform and toluene, producing quinoline through the formation of a triazane intermediate and proton transfer.
While quinoline is a core scaffold for many pharmaceuticals and bioactive compounds, most existing methods for dehydrogenating tetrahydroquinoline require transition metal catalysts and harsh reaction conditions. Although the use of azodicarboxylates has been reported, there were limitations due to a lack of established reaction parameters and substrate scope.
This technology enables the synthesis of various substituted quinolines with yields exceeding 90% by reacting at room temperature for a short time without metal catalysts. The reduced byproduct, dialkyl hydrazadicarboxylate, can be easily separated with hexane and regenerated into an oxidizing agent. It can be applied to the synthesis of quinoline scaffolds for pharmaceutical intermediates and fine chemical materials, reducing both the burden of metal residue removal and reagent costs.
This invention was developed with support from the Ministry of Science and ICT for the development of eco-friendly and economical selective aerobic oxidation reactions.
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