Epoxy and aziridinyl enolsilanes react as oxyallylic cation equivalents in diastereoselective intramolecular stepwise (3+2) cycloadditions with acyclic dienes, outcompeting the (4+3) cycloaddition pathway almost exclusively. Computations reveal the factors behind this preference. Optically-enriched trans-hydrindanone cycloadducts can be generated.
环氧和
氮丙啶烯醇
硅烷在非对映选择性分子内逐步 (3+2) 环加成反应中与无环二烯反应,几乎完全胜过 (4+3) 环加成途径。计算揭示了这种偏好背后的因素。可以产生光学富集的反式-氢化
茚酮环加合物。