By employing a chiral phosphoric acid as a catalyst, an enantioselective aza-Friedel–Crafts reaction of 5-aminoisoxazoles with isatin-derived N-Boc ketimines was realized. The reaction provided a wide variety of novel 3-isoxazole 3-amino-oxindoles with good yields (up to 99%) and moderate to good enantioselectivities (up to 99%). The absolute configuration of one product was assigned by X-ray crystal
通过使用手性
磷酸作为催化剂,实现了 5-
氨基
异恶唑与
靛红衍生的N - Boc 酮
亚胺的对映选择性 aza-Friedel-Crafts 反应。该反应提供了多种新型 3-
异恶唑 3-
氨基-羟
吲哚,产率高(高达 99%),对映选择性适中至良好(高达 99%)。通过 X 射线晶体结构分析确定了一种产物的绝对构型,并提出了合理的反应机理。此外,成功地进行了放大反应。最后,将一种产物与苯
硼酸进行 Suzuki-Miyaura 偶联,以中等收率提供产物,而不会削弱对映选择性。