✦ LIBER ✦

Cycloaddition of 3,4-Dimethoxyfuran with 1,4-Benzoquinones under High Pressure

✍ Scribed by Janusz Jurczak; Tomasz Koz̀gluk; Marek Tkacz; Conrad Hans Eugster

Publisher: John Wiley and Sons
Year: 1983
Tongue: German
Weight: 205 KB
Volume: 66
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19830660122

No coin nor oath required. For personal study only.

✦ Synopsis

High‐pressure cycloaddition of 3,4‐dimethoxyfuran with 1,4‐benzoquinone, toluquinone and 2,3‐dimethoxy‐1,4‐benzoquinone show, at 7 kbar and room temperature, prevailing formation of endo‐isomers. Raising pressure (or temperature) results in a surprising increase of the exo‐isomer. By catalytic hydrogenation of a mixture 3a/4a, followed by chromatography, the pure diastereomers 5 and 6 were obtained.

📜 SIMILAR VOLUMES

High-pressure [2 + 4]-cycloaddition of d

High-pressure [2 + 4]-cycloaddition of dimethylmaleic anhydride to 3,4-dimethoxyfuran; synthesis of dimethoxycantharidin preliminary communication

✍ Jamisz Jurczak; Tomasz Koz̀luk; Stanislaw Filipek; Conrad Hans Eugster 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 German ⚖ 154 KB

## Abstract As an active diene (more active than furan itself), 3,4‐dimethoxyfuran (**1**) affords with many dienophiles the respective cycloadducts in a high yield [2]. It has recently been found that under thermal conditions **1** easily reacts with maleic anhydride and its monomethyl derivative,

[2 + 4]-Cycloaddition under High Pressur

[2 + 4]-Cycloaddition under High Pressure: First Realization of a Diels-Alder Addition of Furan with Simple 1,4-Benzoquinones. Preliminary Communication

✍ Janusz Jurczak; Tomasz Koz̀luk; Stanislaw Filipek; Conrad Hans Eugster 📂 Article 📅 1983 🏛 John Wiley and Sons 🌐 German ⚖ 181 KB

For the first time a successful [2 + 4]‐cycloaddition of furan (**1**) with simple 1,4‐benzoquinones **2** has been realized.

Synthesis of herbicidal 3-substituted-4(

Synthesis of herbicidal 3-substituted-4(3H)-pyrimidinones under high pressure

✍ Artur Jezewski; Janusz Jurczak; Zev Lidert; Colin M. Tice 📂 Article 📅 2001 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 54 KB

## Abstract The reaction of an __N__‐monosubstituted amidine with a β‐ketoester to afford a pyrimidinone is sluggish at best under normal conditions. We now report that this reaction can be effected in moderate yield under high pressure. Thus, 2,6‐dichloro‐4‐pyridyl‐(__N__‐prop‐2‐ynyl)carboxamidine

ChemInform Abstract: [1 + 4]Cycloadditio

ChemInform Abstract: [1 + 4]Cycloaddition of Isocyanides with 2-Acetyl-1,4-benzoquinone; a Convenient Synthesis of Isobenzofuran-4,7-quinones.

✍ Ahmad Shaabani; Shahram Ajabi; Farhad Farrokhzad; Hamid Reza Bijanzadeh 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 26 KB 👁 1 views

ChemInform Abstract: Synthesis of Herbic

ChemInform Abstract: Synthesis of Herbicidal 3-Substituted-4(3H)-pyrimidinones under High Pressure.

✍ Artur Jezewski; Janusz Jurczak; Zev Lidert; Colin M. Tice 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 31 KB 👁 2 views

## Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable v

ChemInform Abstract: Synthesis of 1-Aryl

ChemInform Abstract: Synthesis of 1-Aryl-1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indoles (1,2,3,4-Tetrahydro-β-carbolines) under High Pressures.

✍ N. E. Agafonov; A. V. Dudin; A. A. Preobrazhenskii; V. M. Zhulin 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 30 KB 👁 1 views