Diastereoselective Construction of Tetrahydro-Dispiro[indolinone-3,2′-pyran-5′,4″-pyrazolone] Scaffolds via an Oxa-Michael Cascade [4 + 2] Annulation Reaction
作者:Kanduru Lokesh、Nandarapu Kumarswamyreddy、Venkitasamy Kesavan
DOI:10.1021/acs.joc.2c01370
日期:——
A straightforward metal-free oxa-Michael cascade [4 + 2] annulation reaction was established between isatin-derived Morita–Baylis–Hillman (Is-MBH) alcohols with alkylidene pyrazolones to access structural diverse tetrahydro-dispiro[indolinone-3,2′-pyran-5′,4″-pyrazolone] scaffolds bearing two tertiary and two quaternary stereocenters. The Is-MBH alcohol was utilized as an oxa-Michael donor for the
在靛红衍生的 Morita-Baylis-Hillman (Is-MBH) 醇与亚烷基吡唑啉酮之间建立了一种简单的无金属 oxa-Michael 级联 [4 + 2] 环化反应,以获得结构多样的四氢二螺[indolinone-3,2' -pyran-5',4''-吡唑啉酮]支架具有两个三级和两个四级立构中心。 Is-MBH 醇首次被用作 oxa-Michael 供体,作为高度原子经济转化的新方法。该方法提供了多种仿生新型四氢二螺吲哚-吡喃-吡唑啉酮衍生物,在较短的反应时间(15 分钟)内具有优异的产率(高达 96%)和非对映选择性(高达 >20:1)。