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
Copper-catalyzed synthesis of 2,3-disubstituted indoles from ortho-haloanilines and β-keto esters/β-diketone
作者:Xiao-Guang Liu、Zi-Hao Li、Jian-Wei Xie、Ping Liu、Jie Zhang、Bin Dai
DOI:10.1016/j.tet.2015.12.006
日期:2016.2
Tetrazole-1-acetic acid was identified as an efficient ligand to promote copper-catalyzed domino reaction of ortho-iodo/bromo-anilines with β-keto esters/β-diketone for 2,3-disubstitutedindoles' synthesis with high yields undermildconditions. The protocol, with easy-available catalytic system, shows good substrate tolerance towards various functional groups.
Facile Access to Polysubstituted Indoles via a Cascade Cu-Catalyzed Arylation−Condensation Process
作者:Yu Chen、Xiaoan Xie、Dawei Ma
DOI:10.1021/jo702059q
日期:2007.11.1
hydrolysis delivered 2,3-disubstituted indoles. The halides bearing a strong electron-withdrawing group in the 4-position can undergo in situ basic hydrolysis to provide the corresponding indoles. Polysubstituted indoles can be prepared from substituted 2-halotrifluoroacetanilides with high regioselectivity.
CuI / l-脯氨酸催化的2-卤代三氟乙酰苯胺与β-酮酯和酰胺的交叉偶联,然后进行原位酸性水解,生成了2,3-二取代的吲哚。在4-位带有强吸电子基团的卤化物可进行原位碱性水解以提供相应的吲哚。可以由具有高区域选择性的取代的2-卤代三氟乙酰苯胺制备多取代的吲哚。
Synthesis of Indoles via Domino Reaction of <i>N</i>-Aryl Amides and Ethyl Diazoacetate
作者:Sun-Liang Cui、Jing Wang、Yan-Guang Wang
DOI:10.1021/ja805706r
日期:2008.10.15
A general and concise synthesis of functionalized indoles via dominoreaction of N-aryl amides and ethyl diazoacetate has been developed. The methodology offers a great potential for the synthesis of biologically active and naturallyoccurring indole derivatives.