Organocatalytic Enantioselective Michael–Acetalization–Reduction–Nef Reaction for a One-Pot Entry to the Functionalized Aflatoxin System. Total Synthesis of (−)- Dihydroaflatoxin D<sub>2</sub> and (−)- and (+)-Microminutinin
作者:Wei-Lun Huang、Arun Raja、Bor-Cherng Hong、Gene-Hsiang Lee
DOI:10.1021/acs.orglett.7b01473
日期:2017.7.7
enantioselective synthesis of the aflatoxin system with multiple stereocenters via a sequence of organocatalytic Michael–acetalization–reduction–Nef reactions that proceed with high enantioselectivities (90–99% ee). The one-pot reaction sequence provides a facile entry to the aflatoxin system, including dihydroaflatoxin D2, which includes a formal total synthesis of aflatoxin B2. The first total synthesis of (−)-
Chemoselective N-Heterocyclic Carbene-Catalyzed Cascade of Enals with Nitroalkenes
作者:Zijun Wu、Xu Wang、Fangyi Li、Jicheng Wu、Jian Wang
DOI:10.1021/acs.orglett.5b01692
日期:2015.7.17
An unprecedented N-heterocycliccarbenecatalyzed chemoselective and enantioselective cascade reaction of enals with nitroalkenes has been developed. A wide range of enantioenriched dihydrocoumarins has been prepared, and the reaction goes through an enolate intermediate generated under a catalytic process.
Relay catalysis: combined metal catalyzed oxidation and asymmetric iminium catalysis for the synthesis of Bi- and tricyclic chromenes
作者:Magnus Rueping、Jeremy Dufour、Modhu Sudan Maji
DOI:10.1039/c2cc00129b
日期:——
A catalytic asymmetric oxidative iminium-allenaminecascade allows the use of propargyl alcohols as stable substrates and yields valuable chiral bicyclic 4H-chromenes. A subsequent Michael addition-condensation domino reaction provides complex tricyclic 4H-chromenes in a highlyenantioselective fashion.
dearomative cycloaddition of 3‐nitroindoles and 2‐nitrobenzofurans have emerged as a powerful protocol to construct chiral fused heterocyclic rings. However, organocatalytic dearomative reaction of these two classes of heteroarenes has become a long‐standing challenging task. Herein, we report the first example of phosphine‐catalyzed asymmetric dearomative [3+2]‐cycloadditio of 3‐nitroindoles and 2‐nitrobenzofurans
Three-component reaction between substituted 2-(2-nitrovinyl)-phenols, acetylenedicarboxylate and amines: diversity-oriented synthesis of novel pyrrolo[3,4-c]coumarins
作者:Shuwen Xue、Juan Yao、Jiaming Liu、Lizhong Wang、Xinyu Liu、Cunde Wang
DOI:10.1039/c5ra23392e
日期:——
An efficient and straightforward synthetic protocol has been developed for the preparation of pyrrolo[3,4-c]coumarins via FeCl3-promoted three component reaction between substituted 2-(2-nitrovinyl)phenols, acetylenedicarboxylate and amines for the generation of a wide range of structurally interesting and pharmacologically significant compounds.
已开发出一种有效,简单的合成方案,用于通过FeCl 3促进取代的2-(2-硝基乙烯基)苯酚,乙炔二羧酸酯和胺之间的三组分反应来制备吡咯并[3,4- c ]香豆素,从而产生多种一系列结构上有意义且具有药理学意义的化合物。