Twofold 4-to-6 Ring Expansion of Azetines to Bis-Halogenated Pyridines
Abstract
A sequence of two consecutive skeletal editing steps by carbon-insertions has been developed and allows the regioselective ring expansion of functionalized 2H-azetines to 3,5-bishalogenated pyridines via intermediate formation of 3-halopyrroles. The in situ generation of halogenated carbenes is used to challenge such 2-step transformation and provides access to large library of uniquely sophisticated structures.
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