Transition-metal-free dehydrogenation coupling of pyridinium through a self-promoted hydride transfer process
2017
A transition-metal-free intramolecular cross dehydrogenation coupling reaction of pyridinium was developed. The C(sp2)–H/C(sp2)–H coupling reaction involved an unprecedented intermolecular hydride transfer process from the 1,2-dihydropyridine intermediate to another molecule of pyridinium and formed 1,4-dihydropyridine. Unlike the well-known dehydrogenation coupling proceeded under oxidative conditions, this was the first example of the coupling reaction through a substrate self-promoted hydride transfer process.
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