ButOK-promoted reaction of prop-2-ynyl alcohols 5 or N-methylprop-2-ynylamine 12 with nitroalkenes 1â4 affords 3-methylenetetrahydrofurans 6â9 and 3,4-dihydropyrans 10 and 11 or 3-methylenepyrrolidines 13â16, respectively, in moderate to good yields, with total allylic 1,3-strain-controlled diastereoselectivity.
                                    ButOK 促进的丙-2-炔基醇 5 或 N-甲基丙-2-炔基胺 12 与硝基烯烃 1–4 的反应得到 3-亚甲基
四氢呋喃 6–9 和 
3,4-二氢吡喃 10 和 11 或 3-亚甲基
吡咯烷 13– 16,分别以中等至良好的产率,具有总烯丙基1,3-菌株控制的非对映选择性。