Mono- and dual-difluoroalkylative dearomatization of aryl sulfoxides 1^a.

^aUnless otherwise noted, the reaction was performed under the optimum conditions (condition A: Table 1, entry 5; condition B: Table 1, entry 13). The relative configurations of 4 were deduced from the X-ray structure of 4s.

^bAfter Et₃SiH was added, the reaction mixture was slowly warmed to 0 °C for 1i, 1j, 1q, 1r, and 1s or 20 °C for 1k.

^cAfter warming to room temperature, 1k and 1u decomposed into complex mixtures.