preparation of N‐heterocycles by different routes. For instance, the Cu‐HMOP efficiently catalyzes one‐pot sequential multi‐step oxidative dehydrogenative coupling of 2‐aminobenzyl alcohol with diverse aromatic ketones to afford corresponding quinolines in excellent isolated yields (up to 97 %). Secondly, the present catalyst exhibits good aerobic oxidative dehydrogenation activity of amines to imines
在绿色化学的背景下,使用非贵金属从可再生资源合成N杂环的非均相催化在经济和环境方面引起了极大的兴趣。本文中,我们提出了一种具有纳米棒形貌的三嗪功能分级介孔有机聚合物(HMOP),以及较大的BET表面积〜1218 m 2 g -1,巨大的孔体积和γτ“; 6 mL g -1和双重微/介孔架构。随后的HMOP与氮原子的Cu配位提供了一种强大的催化剂(Cu-HMOP),可完成通过不同途径制备N-杂环的多步级联反应。例如,Cu-HMOP有效催化2-氨基苄醇与各种芳族酮的一锅顺序多步氧化脱氢偶联反应,从而以优异的分离产率(高达97%)提供相应的喹啉。其次,本发明的催化剂表现出胺对亚胺的良好的好氧氧化脱氢活性。第三,对于涉及叠氮化物-炔烃的“点击”反应,Cu-HMOP在室温下以水为溶剂,可定量获得1,4-二取代的1,2,3-三唑衍生物。
Magnetically recyclable γ-Fe2O3–HAP nanoparticles for the cycloaddition reaction of alkynes, halides and azides in aqueous media
作者:Sandip R. Kale、Sandeep S. Kahandal、Manoj B. Gawande、Radha V. Jayaram
DOI:10.1039/c3ra00038a
日期:——
A simple and novel γ-Fe2O3 supported on hydroxyapatite (HAP) heterogeneous catalytic system is described that is useful in the synthesis of disubstituted 1,2,3-triazoles from terminal alkynes and in situ generated organic azide in aqueous media; this green methodology emerges as this new catalyst for the one-pot synthesis of 1,2,3-triazoles can be used in water without the addition of any reagent/base. The catalyst can be successfully recycled five times without significant loss of activity. It is important to note that 100% regioselectivity was observed for the cycloaddition reaction.
Abstract Four Cu(I) complexes bearing dihydrobis(2-mercapto-benzimidazolyl)borate and phosphine co-ligands were synthesized and their catalytic activity was investigated in azide-alkyne reactions. These complexes were tested as catalyst system and among them a Cu(I) complex bearing tricyclohexylphosphine ligand, [Cu(Bb)(PCy3], showed superior catalytic activity in water. The introduced ligands are advantageous
A series of novel bis(NHC) Cu(i) catalysts enables the production of triazoles with different substitution patterns and bioconjugation via “click” chemistry under homogeneous and/or heterogeneous catalytic conditions in aqueous media.
A practical and efficient one-pot procedure for the regioselective synthesis of functionalised 1,4-disubstituted 1,2,3-triaz- oles from primary amines and terminal acetylenes has been established utilising the inexpensive, shelf-stablediazotransferreagentimidazole-1-sulfonylazidehydrochloride.