Highly diastereoselective synthesis of benzothiazolo[3,2-<i>a</i>]pyridines <i>via</i> [4 + 2] annulation reaction of 2-vinylbenzothiazoles and azlactones
作者:Bin Pan、Ao Li、Dong Liu、QingShan Ni、Wu Liang、Fei Du、Jing Gu、Qin Ouyang
DOI:10.1039/d2ob00618a
日期:——
benzothiazolo[3,2-a]pyridine derivatives was readily obtained in good to excellent yields (68–96%), with high diastereoselectivities and tolerating quite a broad scope of substituents. By using chiral phosphoric acid catalyst, the desired products were obtained in high enantioselectivities, up to −94%. This methodology provides a rapid and useful method for constructing fused benzothiazole derivatives.
在温和的反应条件下成功地进行了有效的 AgOTf 催化的 2-乙烯基苯并噻唑和吖内酯的 [4 + 2] 环化反应。通过这种方法,很容易以良好至优异的产率(68-96%)获得一系列新型苯并噻唑并[3,2- a ]吡啶衍生物,具有高非对映选择性和相当广泛的取代基范围。通过使用手性磷酸催化剂,以高达 -94% 的高对映选择性获得所需产物。该方法为构建稠合苯并噻唑衍生物提供了一种快速且有用的方法。