5-bis(diphenylphosphino)-9,9-dimethyl-9H-xanthene], an improved synthesis of indole from vicinal diols and anilines by cooperative catalysis of ruthenium complex and p-TSA (para-toluenesufonic acid) has been demonstrated. The presented synthetic protocol allows assembling a wide range of products in an efficient manner. Comparing to the existed protocols, our indole syntheses can be achieved at lower reaction temperature
通过开发新型高效的双核催化剂[Ru(CO)2(Xantphos)] 2 [黄药 = 4,5-双(二苯基膦基)-9,9-二甲基-9 H -x吨],改进的合成 吲哚已证明通过钌配合物和对-TSA(对甲苯磺酸)的协同催化可从邻二醇和苯胺中分离得到。提出的合成方案可以有效地组装各种产品。与现有协议相比,我们的吲哚 可以在较低的反应温度,较短的反应时间和提高的底物耐受性下完成合成。
Acceptorless dehydrogenative condensation: synthesis of indoles and quinolines from diols and anilines
作者:Delia Bellezza、Ramón J. Zaragozá、M. José Aurell、Rafael Ballesteros、Rafael Ballesteros-Garrido
DOI:10.1039/d0ob01964j
日期:——
The use of diols and anilines as reagents for the preparation of indoles represents a challenge in organic synthesis. By means of acceptorless dehydrogenative condensation, heterocycles, such as indoles, can be obtained. Herein we present an experimental and theoretical study for this purpose employing heterogeneous catalysts Pt/Al2O3 and ZnO in combination with an acid catalyst (p-TSA) and NMP as
使用二醇和苯胺作为制备吲哚的试剂代表了有机合成中的挑战。通过无受体的脱氢缩合,可以获得诸如吲哚的杂环。本文中,我们针对此目的进行了实验和理论研究,将多相催化剂Pt / Al 2 O 3和ZnO与酸催化剂(p-TSA)和NMP作为溶剂。在我们优化的条件下,二醇过量已减少至2当量。这代表了重大进步,并允许使用其他二醇。已使用2,3-丁二醇或1,2-环己二醇,得到2,3-二甲基吲哚和四氢咔唑。另外,已将1,3-丙二醇用于制备喹啉或天然和合成的聚甲基吡啶。
Ruthenium-Catalyzed Synthesis of Indoles from Anilines and Epoxides
A general synthetic route to indolesfrom readily available anilines and epoxides by using ruthenium catalysis is described. This straightforward transformation allows a variety of indoles to be obtained in good yields by using [Ru3(CO)12]/1,1′‐bis(diphenylphosphino)ferrocene as the catalytic system. Water and hydrogen are formed as the only stoichiometric by‐products, making this process highly atom
Nitrogen-containing polyaromatic compounds have been prepared in one step by combining diols and anthracenyl or naphthyl amines via acceptorless dehydrogenative condensation with ZnO and Pt/Al2O3 as heterogeneous catalysts.
含氮多环芳烃化合物通过与作为非均相催化剂的 ZnO 和 Pt/Al 2 O 3进行无受体脱氢缩合将二醇和蒽胺或萘胺结合,一步制得。
Synthesis of Indoles Using the Electrophilic Potential of Diazirines
作者:Yoann Schneider、Amol P. Jadhav、Claude Y. Legault
DOI:10.1021/acs.joc.3c01673
日期:2023.10.20
The electrophilic potential of diazirines has been utilized to obtain N-substituted diaziridines that are directly hydrolyzed to produce monosubstituted hydrazines. The hydrazines can undergo the Fisher process with enolizable carbonyls to yield multiple indole derivatives in moderate to high yields. The N-metalated diaziridine intermediates can undergo isomerization prior to electrophilic substitution