Merging Johnson–Claisen and Aromatic Claisen [3,3]-Sigmatropic Rearrangements: Ytterbium Triflate/2,6-Di-<i>tert</i>-butylpyridine Catalytic System
作者:Viktoria A. Ikonnikova、Ekaterina A. Zhigileva、Amir M. Al Mufti、Pavel N. Solyev、Mikhail S. Baranov、Andrey A. Mikhaylov
DOI:10.1021/acs.joc.3c00368
日期:2023.7.21
a polyfunctional side-chain is described. It is based on two subsequent [3,3]-sigmatropic rearrangements, in particular, Johnson–Claisen and aromatic Claisen. Facilitation of the reaction sequence is achieved by the separation of steps and discovery of the efficient catalysts for aromatic Claisen rearrangement. The best performance was achieved by the combination of rare earth metal triflate with 2
描述了具有多官能侧链的酚的一般合成方法。它基于两个随后的[3,3]-σ重排,特别是约翰逊-克莱森重排和芳香克莱森重排。通过步骤的分离和芳香族克莱森重排的有效催化剂的发现,实现了反应顺序的促进。稀土金属三氟甲磺酸盐与2,6-二叔丁基吡啶的组合获得了最佳性能。反应范围建立在 16 个实例上,产率为 17-80%(分两步)。提出了相关爱尔兰-克莱森和埃申莫瑟克莱森/克莱森重排的合成等价物。一系列修改后的改造证明了产品的进一步多功能性。