Intramolecular Michael Reaction of tert-Butylsulfinyl Ketimines: Asymmetric Synthesis of 3-Substituted Indanones
摘要:
Aromatic tert-butylsulfinyl ketimines bearing a suitable Michael acceptor at the ortho position readily undergo an intramolecular conjugate addition achieving indanone derivatives in good yields and complete diastereoselectivity.
开发温和有效的合成策略,从容易获得的起始材料开始生产重要的分子,在有机合成中是必不可少的。在此,我们提出了一种三氟甲磺酸驱动的双环化途径,从简单的2-甲酰基(或2-酰基)肉桂酸酯和酚类生产功能化的茚并[2,1- c ]色烯-6(7 H )-酮。值得注意的是,该方案通过在单锅中激活非反应性酯部分,能够在无金属反应条件下构建两个 C-C 键和一个 C-O 键。中间体茚醇酯的分离可能表明通过烯酸酯的邻近双键与邻羰基部分进行自分子内环加成,随后用苯酚进行亲电攻击以及随后的环缩合途径。此外,还检查了光物理性质。
Chelation-directed remote <i>meta</i>-C–H functionalization of aromatic aldehydes and ketones
作者:Shuguang Xie、Sen Li、Wenqian Ma、Xiaohua Xu、Zhong Jin
DOI:10.1039/c9cc05807a
日期:——
palladium-catalyzed remote meta-C–H functionalization of aromaticaldehydes and ketones. In situ-generation of acetals and ketals, as well as removal afterwards, makes the C–H bond functionalization process more straightforward and efficient. This also represents the first example of chelation-directed meta-C–H functionalization of aromaticaldehydes and ketones.