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
Oxygenophilic Lewis Acid Promoted Synthesis of 2-Arylindoles from Anilines and Cyanoepoxides in Alcohol
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1021/acs.joc.8b02203
日期:2018.12.7
A convenient synthetic method to indoles from anilines and cyanoepoxides was developed under the catalysis of BF3·OEt2 or AlCl3 in alcohols. The reaction involves a tandem reaction of the regiospecific ring-opening of cyanoepoxides with anilines, elimination of cyanide, intramolecular aromatic electrophilic substitution, and water elimination. The Lewis acid generated protic acid is an efficient catalyst
Thiourea-Mediated Stereospecific Deoxygenation of Cyanoepoxides to Access Highly Diastereopure Alkenyl Nitriles
作者:Yujie Zhang、Shukui Shi、Zhanhui Yang
DOI:10.1021/acs.joc.3c02869
日期:2024.2.16
A practical and efficient protocol for synthesis of >99% diastereopure Z- and E-alkenyl nitriles is developed, through tetramethylthiourea-mediated stereospecificdeoxygenation of respective cis- and trans-cyanoepoxides in ethanol. The desired products are obtained in excellent yields.
Jonczyk; Gadaj, Polish Journal of Chemistry, 2007, vol. 81, # 9, p. 1595 - 1610
作者:Jonczyk、Gadaj
DOI:——
日期:——
Biotransformations of 2,3-epoxy-3-arylpropanenitriles by Debaryomyces hansenii and Mortierella isabellina cells
作者:Malgorzata Zagozda、Jan Plenkiewicz
DOI:10.1016/j.tetasy.2008.06.004
日期:2008.6
Biotransformations of five substituted cis- and trans-oxiranecarbonitriles with Mortierella isabellina DSM 1414, a microbial whole-cell catalyst producing epoxide hydrolases, were investigated. The reactions were stopped when the conversion of the substrates reached 50%. They yielded the appropriate optically active dihydroxycarbonitriles and oxiranecarbonitriles in low enantiomeric purity. Kinetic resolution of rac-syn-2,3-diliydroxy-3-arylpropanenitriles by lipase catalyzed acetylation yielded almost enantiomerically pure (-)-dihydroxynitriles and mixtures of regioisomers of monoacetylated diols. Another microorganism, Debaryomyces hansenii DSM 3428, was used as a source of nitrile hydratases in the kinetic resolution of oxiranecarbonitriles. Only two trans-configured compounds were transformed into the corresponding oxiranecarboxamides. (C) 2008 Elsevier Ltd. All rights reserved.