Amino acid-derived hydroxamic acids as chiral ligands in the vanadium catalysed epoxidation
作者:Andrei V. Malkov、Zaïnaba Bourhani、Pavel Kočovský
DOI:10.1039/b505324b
日期:——
New sulfonamide-derived hydroxamic acids have been developed as chiral ligands for the V-catalysed asymmetric epoxidation, showing high reactivity at subzero temperatures and moderate to good enantioselectivity. The strong accelerating effect exhibited by the ligands of this type can be attributed to the sulfonamide functionality. A range of cinnamyl type allylic alcohols were epoxidised with up to
已开发出新的磺酰胺衍生的异羟肟酸作为V催化的不对称环氧化的手性配体,在零度以下温度下显示出高反应活性,对映选择性中等至良好。这种配体表现出的强促进作用可归因于磺酰胺官能团。一系列肉桂基类型的烯丙基醇被高达74%的ee环氧化。