Benign catalysis with zinc: atom-economical and divergent synthesis of nitrogen heterocycles by formal [3 + 2] annulation of isoxazoles with ynol ethers
作者:Xin-Qi Zhu、Han Yuan、Qing Sun、Bo Zhou、Xiao-Qin Han、Zhi-Xin Zhang、Xin Lu、Long-Wu Ye
DOI:10.1039/c8gc02051e
日期:——
zinc-catalyzed formal [3 + 2] annulation of isoxazoles with ynol ethers under exceptionally mild reaction conditions, leading to the atom-economical and divergent synthesis of 2-alkoxyl 1H-pyrroles and 3H-pyrroles, respectively. Importantly, this zinc-catalyzed protocol demonstrates the dramatically divergent reactivity from the relevant platinum catalysis, where the formal [4 + 2] annulation of isoxazoles with
在此,我们公开了在异常温和的反应条件下,异恶唑与ynol醚的有效锌催化正式[3 + 2]环化反应,导致2-烷氧基1 H-吡咯和3 H-吡咯的原子经济且发散的合成,分别。重要的是,该锌催化的实验方案证明了与相关的铂催化反应截然不同的反应性,其中涉及异恶唑与ynol醚的正式[4 + 2]环合反应。另外,理论计算为所提出的反应机理的可行性提供了进一步的证据,特别是独特的选择性。