Expedient synthesis of pyrrolo[1,2-a]quinoxalines through one-pot three-component reactions of o-phenylenediamines, 2-alkoxy-2,3-dihydrofurans and ketones
作者:Man Wang、Changhui Liu、Yanlong Gu
DOI:10.1016/j.tet.2016.09.014
日期:2016.10
reaction of the dihydrofuran with o-phenylenediamine, which produced a N-(2-aminophenyl)pyrrole derivative that can act as a 1,5-bisnucleophile, and (ii) an intramolecular Mannich-type reaction of the bisnucleophile and ketone to produce the pyrrolo[1,2-a]quinoxaline derivative.
通过2-烷氧基-2,3-二氢呋喃,邻苯二胺和酮的三组分反应合成了吡咯并[1,2- a ]喹喔啉。通过使用三氟化硼醚化物作为催化剂在硝基甲烷中进行该反应。该反应的机理涉及以下两个步骤:(i)二氢呋喃与邻苯二胺的缩合反应,生成可充当1,5-双亲核试剂的N-(2-氨基苯基)吡咯衍生物,和(ii) )双亲核体和酮的分子内曼尼希型反应,生成吡咯并[1,2- a ]喹喔啉衍生物。
Auto-Tandem Catalysis-Induced Synthesis of Trisubstituted Furans through Domino Acid-Acid-Catalyzed Reaction of Aliphatic Aldehydes and 1,3-Dicarbonyl Compounds by using<i>N</i>-Bromosuccinimide as Oxidant
作者:Wenbo Huang、Changhui Liu、Yanlong Gu
DOI:10.1002/adsc.201700074
日期:2017.6.6
A simple aluminium(III) chloride‐catalyzed synthesis of tri‐substitutedfurans from aliphatic aldehydes and 1,3‐dicarbonyl compounds was developed by using N‐bromosuccinimide (NBS) as an oxidant. This method was effective for the synthesis of various furan derivatives. Some of the products were not accessible with the previously reported methods. Mechanically, this reaction involved an auto‐tandem
2‐Alkoxy‐2,3‐dihydrofurans were found to be versatile benzannulation reagents. Indoles can be synthesized in good to excellent yields via the [4+2] annulation of 2‐butoxy‐2,3‐dihydrofuran with pyrroles catalyzed by copper bromide. With the same protocol, carbazoles can also be obtained when indoles are used as starting material with the aid of p‐toluenesulfonic acid. This type of benzannulation reagent
Asymmetric Synthesis of 2,3-Dihydrofurans by Reaction of Rhodium-Stabilized Vinylcarbenoids with Vinyl Ethers
作者:Huw M. L. Davies、Gulzar Ahmed、Rebecca L. Calvo、Melvyn Rowen Churchill、David G. Churchill
DOI:10.1021/jo972189b
日期:1998.4.1
Rhodium(II) octanoate catalyzed decomposition of 2-diazo-3-siloxybutenoates, containing (R)-pantolactone as a chiral auxiliary, in the presence of vinylethers results in the diastereoselective synthesis of cyclopropanes with high asymmetric induction. Treatment of the cyclopropanes with tetrabutylammonium fluoride results in desilylation and ring expansion of the resulting acylcyclopropanes to 2,3-dihydrofurans