method for the construction of hydrocarbazoles bearing three continuous sterically hindered stereocenters, two quaternary and one tertiary, via a highly diastereoselective palladium-catalyzed [4 + 2]-cycloaddition/dearomatization of 3-nitroindoles has been developed. The cycloaddition of 3-nitroindoles occurs at ambient conditions with a 1,4-zwitterionic intermediate, in situ generated from γ-methyli
开发了一种通过高度非对映选择性
钯催化的 [4 + 2]-环加成/脱芳构化
3-硝基
吲哚来构建具有三个连续空间位阻立构中心(两个四元和一个三元)的氢
咔唑的有效方法。
3-硝基
吲哚的环加成发生在环境条件下,1,4-两性离子中间体由 γ-亚甲基-
δ-戊内酯原位生成。该方法的进一步综合效用通过产品可能的多方面转换得到证明。还探索了这种转化的催化不对称方面。