A New Method of Synthesis of 2-Alkoxycarbonyl 3-aryg-3,4-dihydro Quinoxalines and 2-Alkoxycarbonyl3-aryl Quinoxalines
摘要:
Cyanoesters epoxides 1, when treated with o-phenylenediamine in presence or absence of hydrogen chloride, at reflux of acetonitrile, give the 2-alkoxycarbonyl-3-aryl-3,4-dihydro quinoxalines and 2-alkoxy carbonyl-3-aryl quinoxalines in good yields.
Pyrenediones (PYDs) are efficient photocatalysts for three oxygenation reactions: epoxidation of electron deficient olefins, oxidative hydroxylation of organoborons, and oxidation of sulfides via in situgeneration of H2O2 under visible light irradiation, using oxygen as a terminal oxidant and IPA as a solvent and a hydrogen donor.
吡咯二酮(PYDs)是用于三种氧化反应的有效光催化剂:缺电子烯烃的环氧化,有机硼的氧化羟基化以及在可见光照射下通过原位生成H 2 O 2,使用氧作为末端氧化剂和IPA作为硫化物的氧化溶剂和氢供体。
Chemoenzymatic Synthesis of α-Cyano Epoxides by a Tandem-Knoevenagel-Epoxidation Reaction
作者:Fengjuan Yang、Xiaowen Zhang、Fengxi Li、Zhi Wang、Lei Wang
DOI:10.1002/ejoc.201501501
日期:2016.3
The lipase‐mediated efficient synthesis of α‐cyano epoxides through a tandem‐Knoevenagel–epoxidation reaction is described for the first time. Besides providing a green, mild, and convenient method for the synthesis of α‐cyano epoxides, this work also extends the applicability of lipase in organic synthesis.
Hypervalent Iodine(III)-Catalyzed Epoxidation of β-Cyanostyrenes
作者:Saeesh R. Mangaonkar、Fateh V. Singh
DOI:10.1055/s-0039-1690621
日期:2019.12
radiations. The β-cyanoepoxides were isolated in good to excellent yields in a short reaction time. A convenient approach for the synthesis of β-cyanoepoxides is illustrated by iodine(III)-catalyzed epoxidation of electron-deficient β-cyanostyrenes, wherein the active catalytic iodine(III) species was generated in situ. The epoxidation of β-cyanostyrenes was performed using 10 mol% PhI as precatalyst in the
Addition des ylures de carbonyle derives de gem-dicyanoepoxydes sur les benzylidene anilines substituees
作者:A. Robert、J.J. Pommeret、E. Marchand、A. Foucaud
DOI:10.1016/s0040-4020(01)93318-6
日期:1973.1
The reaction of substituted benzylidene anilines with 1,1-dicyano or 1-cyano 1-ethoxycarbonyl epoxides gives oxazolidines, the structures of which is established by NMR spectroscopy. The formation of oxazolidines proceeds via regiospecific addition of epoxide derived ylid to imine. The influence of ylid substituants and imine substituants on the reaction may be interpreted by interactions of the frontier
Aminolyse aryl- und arylalkyl-substituierter Cyano-oxirane mit Piperidin
作者:Peter Tinapp、Ute Groeneveld
DOI:10.1002/ardp.19863191211
日期:——
Die Aminolyse der Cyano‐oxirane 1a–g führt primär überwiegend zu Ringöffnungsprodukten vom Isoserintyp 2a–e. Eine Ausnahme bilden die an C‐3‐disubstituierten Cyano‐oxirane 1f, 1g. Hier verläuft die Ringöffnung mit eindeutiger Regioselektivität zu Verbindungen vom Serintyp 5f, 5g.
氰基 - 环氧乙烷 1a - g 的氨解主要主要导致异丝氨酸 2a - e 型的开环产物。C-3-二取代氰基-环氧乙烷1f、1g是个例外。在此开环对丝氨酸类型5f、5g的化合物具有明显的区域选择性。