Asymmetric Synthesis of Chiral Oxazolines by Organocatalytic Cyclization of α-Aryl Isocyanoesters with Aldehydes
作者:Liu-Zhu Gong、Meng-Xia Xue、Chang Guo
DOI:10.1055/s-0029-1217549
日期:2009.8
A cinchona alkaloid derivative catalyzed the asymmetric formal [3+2] cycloaddition of α-aryl isocyanoesters with aldehydes, affording highly substituted 2-oxazolines with good stereoselectivities of up to 18:1 dr and 90% ee.
一种金鸡纳生物碱衍生物催化了δ-芳基异氰酸酯与醛的不对称形式[3+2]环加成反应,得到了高度取代的 2-恶唑啉,其立体选择性高达 18:1 dr 和 90% ee。
Ag-Catalyzed Asymmetric Interrupted Barton–Zard Reaction Enabling the Enantioselective Dearomatization of 2- and 3-Nitroindoles
作者:Wei-Cheng Yuan、Xin-Meng Chen、Jian-Qiang Zhao、Yan-Ping Zhang、Zhen-Hua Wang、Yong You
DOI:10.1021/acs.orglett.1c04036
日期:2022.1.28
We disclose a Ag-catalyzed asymmetric interrupted Barton–Zard reaction of α-aryl-substituted isocyanoacetates with 2- and 3-nitroindoles, which enables the dearomatization of nitroindoles and hence offers rapid access to an array of optically active tetrahydropyrrolo[3,4-b]indole derivatives bearing three contiguous stereogenic centers, including two tetrasubstituted chiral carbon atoms with pretty
我们公开了 α-芳基取代的异氰基乙酸酯与 2-和 3-硝基吲哚的 Ag 催化不对称间断 Barton-Zard 反应,这使得硝基吲哚脱芳构化成为可能,因此可以快速获得一系列光学活性四氢吡咯并[3,4- b ]吲哚衍生物具有三个连续的立体中心,包括两个四取代的手性碳原子,具有很好的结果(高达 99% 的产率,91:9 dr 和 96% ee)。该协议的合成潜力通过产品的克级反应和多功能转化展示了出来。