Reactivity of epoxy-ynamides with metal halides: nucleophile (Br/Cl/OH)-assisted tandem intramolecular 5-exo-dig or 6-endo-dig cyclisation and AgF2-promoted oxidation
Literature Information
Mandala Anitha, Mallepalli Shankar, K. C. Kumara Swamy
Several metal halides react with epoxy-ynamides. Thus, CuBr-mediated concomitant bromination/5-exo-dig cyclisation of epoxy-ynamides affords functionalised 1,3-oxazolidines. In contrast, functionalised 1,4-oxazines are obtained via 6-endo-dig cyclisation of epoxy-ynamides using LiCl or CuF2/H2O. In addition, CuBr is effective for dibromination of functionalised ynamides leading to α,β-dibromo-enamides, with the (E) isomer predominating. Formation of epoxy-1,2-dioxo-amides by oxidation of epoxy-ynamides using AgF2 as the oxidising agent is also highlighted.
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Organic Chemistry Frontiers

Organic Chemistry Frontiers publishes high-quality research from across organic chemistry. Emphases are placed on studies that make significant contributions to the field of organic chemistry by reporting either new or significantly improved protocols or methodologies. Topics include, but are not limited to the following: Organic synthesis Development of synthetic methodologies Catalysis Natural products Functional organic materials Supramolecular and macromolecular chemistry Physical and computational organic chemistry
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