Under mild conditions, a broad range of bispirotetrahydrofuran oxindoles have been synthesized with excellent stereoselectivities through the cascade Michael/hemiketalization/Friedel–Crafts reaction of β,γ-unsaturated α-ketoamide and 2-hydroxy-1-indanone. The reaction can be performed on a gram scale with low catalyst loading (2 mol %) without impacting its efficiency.
                                    通过协同双核
锌-AzePhenol催化剂描述了一种对映选择性构建双螺
四氢呋喃羟
吲哚的新的有效途径。在温和的条件下,通过β,γ-不饱和α-酮酰胺和
2-羟基-1-茚满酮的级联迈克尔/半
缩酮化/弗里德-克拉夫茨反应,合成了多种具有优良立体选择性的双螺
四氢呋喃恶
吲哚。该反应可以以克级进行,催化剂负载量低(2mol%),而不会影响其效率。