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A convenient and efficient method for the synthesis of furoxan derivatives from α-nitro-ketoximes and sulfonyl chlorides is reported. A wide variety of furoxan derivatives were smoothly obtained in good yields via a DABCO-mediated cascade sulfonylation/cyclization process under mild conditions. The usefulness of this method was also demonstrated by the conversions of the furoxan products into other promising compounds. [ABSTRACT FROM AUTHOR]

Silver forges the ring: A new and practical silver‐catalyzed [5+2] cycloaddition method has been developed for the synthesis of azepines through the formation of four new chemical bonds between a γ‐amino ketone and an alkyne in one step. This method provides a new hetero‐[5+2] cycloaddition strategy for the construction of seven‐membered ring systems. [ABSTRACT FROM AUTHOR]

A novel method for the synthesis of 2,3-dihydro-1H-azepines is established using a silver-catalyzed [5 + 2] cycloaddition of γ-aminoketones with terminal alkynes. [ABSTRACT FROM AUTHOR]