Specific <i>Z</i>-Selectivity in the Oxidative Isomerization of Allyl Ethers to Generate Geometrically Defined <i>Z</i>-Enol Ethers Using a Cobalt(II)(salen) Complex Catalyst
作者:Guanxin Huang、Miaolin Ke、Yuan Tao、Fener Chen
DOI:10.1021/acs.joc.0c00004
日期:2020.4.17
synthesis of the geometrically less stable Z-enol ethers is challenging. An efficient Z-selective oxidative isomerization process of allyl ethers catalyzed by a cobalt(II) (salen) complex using N-fluoro-2,4,6-trimethylpyridinium trifluoromethanesulfonate (Me3NFPY•OTf) as an oxidant has been developed. Thermodynamically less stable Z-enol ethers were prepared in excellent yields with high geometric control.
烯醇醚的结构基序存在于许多高度氧化的生物活性天然产物和药物中。几何上不稳定的Z-烯醇醚的合成具有挑战性。已经开发出一种有效的Z-烯丙基醚(Zalen)配合物使用N-氟-2,4,6-三甲基吡啶三氟甲磺酸盐(Me3NFPY•OTf)作为氧化剂催化的烯丙基醚的Z选择氧化异构化方法。热力学稳定性较低的Z-烯醇醚以高收率和高几何控制制备。该方法还证明了在室温下控制二烯丙基醚的Z-选择性异构化反应的有效性。该催化体系提供了另一种途径来扩展烯丙基醚的传统还原异构化。