Catalytic Asymmetric 1,3-Dipolar Cycloaddition of Nitrile Oxides to an Achiral Allyl Alcohol Utilizing Diisopropyl Tartrate as a Chiral Auxiliary
作者:Makoto Shimizu、Yutaka Ukaji、Katsuhiko Inomata
DOI:10.1246/cl.1996.455
日期:1996.6
The catalytic asymmetric 1,3-dipolar cycloaddition of nitrile oxides to an achiral allyl alcohol was achieved by the use of a catalytic amount of diisopropyl (R,R)-tartrate as a chiral auxiliary to afford the corresponding (R)-2-isoxazolines with high enantioselectivity. In order to realize reproducible higher stereoselection, the addition of a small amount of ethereal compound such as 1,4-dioxane
通过使用催化量的 (R,R)-酒石酸二异丙酯作为手性助剂,将腈氧化物催化不对称 1,3-偶极环加成反应为非手性烯丙醇,得到相应的 (R)-2-异恶唑啉具有高对映选择性。为了实现可重复的更高立体选择,添加少量的醚化合物如 1,4-二恶烷是至关重要的。