Enantioselective C−H alkylation/cyclization of sulfondiimines with sulfoxonium ylides using a RuII catalyst and a newly developed chiral spiro carboxylic acid enables the synthesis of 1,2-benzothiazine 1-imines, thus expanding the accessible chemical space of chiral hexavalent organosulfur scaffolds relevant to biologically active compounds.
A simple and efficient protocol was developed for the preparation of challenging α-aryl primary amides. This metal-free coupling process was triggered by TfOH-promoted electrophilicactivation of α-silyl nitrile to generate keteniminium ion species, followed by reaction with aryl sulfoxide through [3,3]-sigmatrophic rearrangement to provide the target product. To the best of our knowledge, α-silyl