Selenocyclisations of the homoallylic sulfonamides [e.g., 26, 28 and 30] using phenylselanyl halides lead exclusively to β-selanyl-pyrrolidines [e.g., 27, 29 and 31] by an overall 5-endo-trig pathway, but with considerable variations in the stereochemical outcome, depending upon the substituents and the precise conditions used. Subsequent oxidative eliminations lead smoothly to the corresponding 3-pyrrolines
的高烯丙基磺酰胺Selenocyclisations [例如,26,28和30 ]使用phenylselanyl卤化物只导致β-selanyl-
吡咯烷[例如,27,29和31 ]由一个整体5-内切- TRIG途径,但在相当大的差异立体
化学结果,取决于取代基和使用的精确条件。随后的氧化消除平滑地导致相应的
3-吡咯啉,并因此产生多羟基化的
吡咯烷。