6pi-electrocyclization to form nitronate intermediates, which can be captured through tandem [3 + 2] dipolar cycloadditions to form highly functionalized nitroso acetals. The one-pot, two-step domino process is highly efficient, proceeding with good facial selectivity and exoselectivity. Dipolarophiles featuring electron-rich, -neutral, and -deficient carbon-carbon double bonds are viable substrates
加热后,硝基二烯通过 6pi 电环化重排形成硝基中间体,后者可以通过串联 [3 + 2] 偶极环加成被捕获,形成高度官能化的亚硝基
缩醛。一锅两步多米诺骨牌工艺效率高,具有良好的面部选择性和外选择性。具有富电子、中性和缺乏碳-碳双键的偶极体是与原位生成的硝基进行 [3 + 2] 环加成反应的可行底物。此外,高度官能化的亚硝基
缩醛产物可以选择性地氢解以形成高度官能化的螺环羟基酰胺或羟基γ-
氨基酸。