A Photoredox‐Induced Stereoselective Dearomative Radical (4+2)‐Cyclization/1,4‐Addition Cascade for the Synthesis of Highly Functionalized Hexahydro‐1
<i>H</i>
‐carbazoles
synthesis of functionalized hexahydrocarbazoles was developed based on an unprecedented photoredox‐induced dearomative radical (4+2)‐cyclization/1,4‐addition cascade between 3‐(2‐iodoethyl)indoles and acceptor‐substituted alkenes. The title reaction simultaneously generates three C−C bonds and one C−H bond, along with three contiguous stereogenic centers. The hexahydro‐1H‐carbazole products are highly valuable
A new palladium-catalyzed cyclization of N-alkenyl-o-haloanilines with selective isomerization of a double bond followed by formal 5-endo-trig cyclization was developed. A variety of fused and 2-substitutedindoles were synthesized from enaminoesters prepared by condensation of β-ketoesters and o-iodoaniline.
Triarylaminium Radical Cation Promoted Coupling of Catharanthine with Vindoline: Diastereospecific Synthesis of Anhydrovinblastine and Reaction Scope
作者:Byron A. Boon、Dale L. Boger
DOI:10.1021/jacs.9b06968
日期:2019.9.11
vindoline is disclosed, enlisting tris(4-bromophenyl)aminium hexachlororantimonate (BAHA, 1.1 equiv) in aqueous 0.05 N HCl/trifluoroethanol (2-10:1) at room temperature (25 °C), that provides anhydrovinblastine in superb yield (85%) with complete control of the newly formed quaternary C16' stereochemistry. A definition of the scope of aromatic substrates that participate with catharanthine in the BAHA-mediated
公开了一种新的三芳基胺自由基阳离子促进长春花碱与文多林的偶联,在室温 (25°C) 下,在 0.05 N HCl/三氟乙醇 (2-10:1) 水溶液中加入三(4-溴苯基)胺六氯锑酸盐(BAHA,1.1 当量) ),以极好的收率 (85%) 提供脱水长春碱,并完全控制新形成的四元 C16' 立体化学。公开了在 BAHA 介导的非对映选择性偶联反应中与长春花碱一起参与的芳香底物的范围的定义,以及参与反应的长春花碱以外的简化吲哚底物的范围,这些底物确定了参与反应所需的关键结构特征,提供了广义的吲哚与长春花碱或文多林几乎没有结构关系的功能化反应。
Bobbitt, James M.; Scola, Paul M.; Kulkarni, Chidambar L., Heterocycles, 1986, vol. 24, # 3, p. 669 - 678
作者:Bobbitt, James M.、Scola, Paul M.、Kulkarni, Chidambar L.、DeNicola, Anthony J.、Chou, Thomas T. -t.