BF<sub>3</sub>·OEt<sub>2</sub>-promoted tandem Meinwald rearrangement and nucleophilic substitution of oxiranecarbonitriles
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1039/c9ob02428j
日期:——
Tandem Meinwald rearrangement and nucleophilicsubstitution of oxiranenitriles was realized. Arylacetic acid derivatives were readily synthesized from 3-aryloxirane-2-carbonitriles with amines, alcohols, or water in the presence of boron trifluoride under microwave irradiation, and the designed synthetic strategy includes introducing a cyano leaving group into arylepoxides and capturing the in situ
Metal-free and regiospecific synthesis of 3-arylindoles
作者:Chuangchuang Xu、Wenlai Xie、Jiaxi Xu
DOI:10.1039/d0ob00317d
日期:——
arylhydrazine hydrochlorides and Fischer indolization. The organic base triethylamine plays a crucial role in the final elimination step in the Fischer indole synthesis, affording 3-arylindoles regiospecifically. The reaction features advantages of microwave acceleration, non-metal participation, short reaction time, organic acid-base co-catalysis, and broad substrate scope.
BF3·OEt2-Catalyzed Synthesis of anti-β-(N-Arylamino)-α-hydroxynitriles by Regio- and Diastereospecific Ring Opening of 3-Aryloxirane-2-carbonitriles with Anilines
作者:Chuangchuang Xu、Yang Lu、Kaini Xu、Jiaxi Xu
DOI:10.1055/s-0039-1690243
日期:2020.2
anti-β-(N-arylamino)-α-hydroxynitriles from 3-aryloxirane-2-carbonitriles and anilines was developed under the catalysis of BF3·OEt2 in ethanol. In this method, BF3·OEt2 first reacts with ethanol to produce the true catalyst of super acid H[B(OEt)F3], followed by an acid-catalyzed regio- and diastereospecific ring opening of oxirane-2-carbonitriles with anilines, generating anti-β-(N-arylamino)-α-hydroxynitriles
New synthetic routes to β-fluoro β-phenyllactic acid derivatives and β-fluorocyanohydrins
作者:A.I. Ayi、M. Remli、R. Condom、R. Guedj
DOI:10.1016/s0022-1139(00)82265-4
日期:1981.6
Alkyl phenyl 2,3-epoxycarboxylates from the well-known Darzens glycidic esters synthesis react under very mild conditions with pyridinium-poly-hydrogen fluoride to give corresponding 3-fluoro 3-phenyllactates in almost quantitative yields with a high regio and stereoselectivity.
Zur Darstellung von 4-Cyano-1.3-dioxolanen aus 2.3-Epoxynitrilen
作者:Wolfgang Althoff、Peter Tinapp
DOI:10.1002/ardp.19823150314
日期:——
Aus den 2.3‐Epoxynitrilen 2 und Aceton wurden in Gegenwart von Bortrifluorid die 4‐Cyano‐1.3‐dioxolane 3 hergestellt. Der stereospezifische Reaktionsablauf wird diskutiert. Ein verbessertes Verfahren zur Herstellung der 2.3‐Epoxynitrile 2 wird beschrieben.