Highly diastereoselective synthesis of 3-methylenetetrahydropyrans by palladium-catalyzed oxa-[4 + 2] cycloaddition of 2-alkenylbenzothiazoles
作者:Xiaoxiao Song、Lei Xu、Qijian Ni
DOI:10.1039/d0ob01434f
日期:——
A highly diastereoselective synthesis of 3-methylenetetrahydropyrans via palladium-catalyzed oxa-[4 + 2] cycloaddition of 2-alkenylbenzothiazoles with allyl carbonates bearing a nucleophilic alcohol side chain is presented. This synthetic methodology tolerates a wide variety of 2-alkenylbenzothiazoles and afforded the desired 3-methylenetetrahydropyrans in good yields and excellent dr. In addition
提出了通过钯催化的 oxa-[4 + 2] 环加成 2-烯基苯并噻唑与带有亲核醇侧链的碳酸烯丙酯的高度非对映选择性合成 3-亚甲基四氢吡喃。这种合成方法可以耐受多种 2-烯基苯并噻唑,并以良好的收率和出色的结果提供所需的 3-亚甲基四氢吡喃。此外,进一步的衍生产生了新的支架,使它们成为有用的合成前体。