A novel and practical synthesis of heterocyclic enamines has been developed from the formal ring enlargement of cyclic ketones, which comprised the retro-Reformatsky fragmentation reaction as a key step. Under alkaline bromination conditions, the Reformatsky adducts derived from five- to seven-membered cyclic ketones underwent efficiently a direct retro-Reformatsky fragmentation, followed by spontaneous alpha,alpha-dibromination, to produce alpha,alpha,omega-tribromo-beta-ketoester compounds ...Expand abstract
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A direct retro-Reformatsky fragmentation: formal ring enlargement of cyclic ketones for novel and practical synthesis of heterocyclic enamines.
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