A New Preparative Route to Substituted Dibenzofurans by Benzannulation Reaction. An Application to the Synthesis of Cannabifuran
作者:Stefano Serra、Claudio Fuganti
DOI:10.1055/s-2003-42037
日期:——
A new regioselective pathway to substituted dibenzofuran derivatives is described here. According to this procedure substituted 1-acetoxy-3-alkoxycarbonyl dibenzofurans are obtained by treatment of 6-(2-methoxyaryl)-3-alkoxycarbonylhex-3-en-5-ynoic acids with acetic anhydride in the presence of sodium acetate. The latter acids are prepared from the easily available substituted o-iodo-anisoles by Sonogashira
Nickel-Catalyzed Asymmetric Cross-Electrophile <i>trans</i>-Aryl-Benzylation of α-Naphthyl Propargylic Alcohols
作者:Zhiyang Lin、Weitao Hu、Linchuan Zhang、Chuan Wang
DOI:10.1021/acscatal.3c01346
日期:2023.5.19
Herein, we report a nickel-catalyzed asymmetric three-component trans-dicarbofunctionalization of β-substituted α-naphthyl propargylicalcohols using readily available aryl and benzyl halides as the coupling partners under reductive conditions. This cross-electrophile strategy enables the synthesis of various axially chiral allylic alcohols bearing a tetrasubstituted olefinic unit in complete regio-
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‐Quinodimethane Atropisomers: Enantioselective Synthesis and Stereospecific Transformation
作者:Jianyang Dong、Andreas Ostertag、Christof Sparr
DOI:10.1002/anie.202212627
日期:2022.12.12
The enantioselective synthesis of atropisomeric o-quinodimethanes and their viability for highly stereoselective transformations are described. o-Quinodimethane precursors were readily accessible by an intramolecular [2+2+2] cycloaddition of triyne substrates and the in situ generated o-quinodimethane atropisomers were converted in highly stereospecific Diels–Alder reactions at elevated temperature
介绍了阻转异构o-喹啉二甲烷的对映选择性合成及其在高度立体选择性转化中的可行性。o-喹啉二甲烷前体很容易通过三炔底物的分子内 [2+2+2] 环加成反应获得,并且原位生成的o-喹啉二甲烷阻转异构体在高温下以高达 96 : 4 er 的高度立体特异性 Diels-Alder 反应转化