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.
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.
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