Spirocyclization of keto-ynesulfonamides with quaternary ammonium salts was performed to access aza-spiro compounds. Exclusive E-configured 5-exo-dig compounds were isolated from keto-ynesulfonamides substituted by an aryl- or a vinyl group, whereas 6-endo-dig compounds were favored from terminal ynesulfonamides.
F. Beltran, L. Andna and L. Miesch, Org. Chem. Front., 2019, 6, 373 DOI: 10.1039/C8QO00937F
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