inhibition of the undesired Glaser coupling side reaction. The substratescope is broad, covering (hetero)aryl-, alkynyl-, and aminocarbonyl-substituted alkenes, (hetero)aryl and alkyl as well as silyl alkynes, and tertiary to primary alkyl radical precursors with excellent functional group compatibility. Facile transformations of the obtained chiral alkynes have also been demonstrated, highlighting
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。
Catalytic Enantio- and Diastereoselective Mannich Addition of TosMIC to Ketimines
作者:Allegra Franchino、Jack Chapman、Ignacio Funes-Ardoiz、Robert S. Paton、Darren J. Dixon
DOI:10.1002/chem.201804099
日期:2018.12.3
pharmaceutical and agrochemical sectors, as well as in catalysis. Catalytic asymmetric Mannich additions represent a valuable method to access such compounds in enantioenriched form. This work reports the first enantio‐ and diastereoselectiveaddition of commercially available p‐toluenesulfonylmethyl isocyanide (TosMIC) to ketimines, affording 2‐imidazolines bearing two contiguous stereocenters, one of which
Highly Diastereo- and Enantioselective Silver-Catalyzed Double [3+2] Cyclization of α-Imino Esters with Isocyanoacetate
作者:Pan-Lin Shao、Jia-Yu Liao、Yee Ann Ho、Yu Zhao
DOI:10.1002/anie.201402788
日期:2014.5.19
Presented herein is a new complexity‐generating method in which both functionalities of α‐imino esters undergo stereoselective cyclization with isocyanoacetates to produce directly linked oxazole‐imidazolines, which can be transformed into highly functionalized α,β‐diamino esters and imidazolinium salts in high diastereo‐ and enantiopurity.