Gupta, K. A.; Saxena, Anil K.; Jain, Padam C., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 4, p. 384 - 387
Ligand-Free Copper-Catalyzed Arylation of Amidines
摘要:
Copper-catalyzed cross-coupling reactions of amidine salts were utilized to synthesize monoarylated amidines in moderate to high yields with ligand-free conditions. DMF was the superior solvent for the N-arylation of benzamidines, while MeCN was used in the formation of N-aryl amidines in moderate to high yield.
We report a novel and practical one-pot Rh(III)-catalyzed strategy to construct benzimidazo[1,2-a]quinolines from readily available imidamides and anthranils. The cascade reaction proceeds via a C-H amination-cyclization-cyclization process in ionic liquid without any additives and possesses simple operation, moderate-to-high yield, and broad substrate scope features, which will provide the reference
Rh(III)-Catalyzed Synthesis of <i>N</i>-Unprotected Indoles from Imidamides and Diazo Ketoesters via C–H Activation and C–C/C–N Bond Cleavage
作者:Zisong Qi、Songjie Yu、Xingwei Li
DOI:10.1021/acs.orglett.5b03669
日期:2016.2.19
The synthesis of N-unprotected indoles has been realized via Rh(III)-catalyzed C–Hactivation/annulation of imidamides with α-diazo β-ketoesters. The reaction occurs with the release of an amide coproduct, which originates from both the imidamide and the diazo as a result of C═N cleavage of the imidamide and C–C(acyl) cleavage of the diazo. A rhodacyclic intermediate has been isolated and a plausible
Ruthenium(II)‐Catalyzed C−H Activation of Imidamides and Divergent Couplings with Diazo Compounds: Substrate‐Controlled Synthesis of Indoles and 3
<i>H</i>
‐Indoles
作者:Yunyun Li、Zisong Qi、He Wang、Xifa Yang、Xingwei Li
DOI:10.1002/anie.201606316
日期:2016.9.19
Indoles are an important structural motif that is commonly found in biologically active molecules. In this work, conditions for divergentcouplings between imidamides and acceptor–acceptor diazo compounds were developed that afforded NH indoles and 3H‐indoles under ruthenium catalysis. The coupling of α‐diazoketoesters afforded NH indoles by cleavage of the C(N2)−C(acyl) bond whereas α‐diazomalonates
Synthesis of indoles and quinazolines <i>via</i> additive-controlled selective C–H activation/annulation of <i>N</i>-arylamidines and sulfoxonium ylides
Selective synthesis of indoles and quinazolines was achieved through a precise control of C–H activation/annulation by changing additives.
通过改变添加剂,通过精确控制C-H活化/环化实现了对吲哚和喹唑啉的选择性合成。
Reactivity-Controlled Regioselectivity: A Regiospecific Synthesis of 1,2-Disubstituted Benzimidazoles
作者:Xiaohu Deng、Neelakandha S. Mani
DOI:10.1002/ejoc.200901056
日期:2010.2
combination of N 1 /N 2 chemoselectivity on the amidine and reactivity-controlled X 1 /X 2 chemoselectivity on the 1,2-dihaloarene. This reaction proves to be fairly general for the regiospecificsynthesis of 1,2-substituted benzimidazoles.