A sequence of carbon-insertion steps enables regioselective synthesis of bis-halogenated pyridines from azetines, implying new pathways for functionalization.
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....
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Ghazali et al. (2026) studied this question.
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