A series of BCB-sulfoximines and related derivatives was then prepared on a 2 mmol scale (Scheme 2). Enantioenriched BCB-sulfoximine (S)-2b gave complete retention of the stereochemical information of the substrate. High yields of BCB-sulfoximines were achieved with arenes bearing electronwithdrawing aryl substituents though electron rich 4methoxyphenyl derivative was also tolerated (2c and 2d), further indicating the significance of the a-proton pKa on the success of the BCB formation. 2-Pyridyl derivative 2e similarly gave a good yield. Other BCB derivatives were prepared using the developed reaction conditions, including tBu-BCB-sulfoximine 2f and sulfonimidamide-BCB 2g. Previously reported sulfoxide and sulfone-BCB derivatives 2h and 2i were also successfully prepared through this 1-pot process. Scheme 2. Substrate scope of sulfur-containing BCB compounds.