Rhodium(II)‐Catalyzed Intramolecular Transannulation of 4‐Methoxycyclohexa‐2,5‐dienone Tethered 1‐Sulfonyl‐1,2,3‐triazoles: Synthesis of Azaspiro[5.5]undecane Derivatives

Abstract

Abstract A Rh(II)‐catalyzed denitrogenative intramolecular transannulation using 4‐methoxycyclohexa‐2,5‐dienone tethered N ‐sulfonyl‐1,2,3‐triazoles as substrates has been developed, affording diversified 3‐methoxy‐1‐tosyl‐1‐azaspiro[5.5]undecanes in moderate to good yields under mild conditions. This new synthetic method proceeded through an oxonium ylide generated from trapping a rhodium(II)‐carbene by methoxy group, a methoxy group migration, and C−N bond formation, providing an interesting synthetic strategy for the construction of spirocyclic frameworks. magnified image