Synthesis of 2-Acylated Indoles through Palladium-Catalyzed Dehydrogenative Coupling of N-Pyrimidine-Protected Indoles with Aldehydes and Ethyl Glyoxylate
作者:Ze Tan、Wenduo Wang、Jidan Liu、Qingwen Gui
DOI:10.1055/s-0034-1379935
日期:——
C2-Acylated indoles have been synthesized in good yields through palladium-catalyzed dehydrogenative coupling of N -pyrimidine-protected indoles using aldehydes as the source of acyl reagent and tert -butyl hydroperoxide as the oxidant. 2-Indole carboxylates can be synthesized when aldehydes are substituted by ethyl glyoxylate.
RhCl<sub>3</sub>·3H<sub>2</sub>O-Catalyzed Regioselective C(sp<sup>2</sup>)–H Alkoxycarbonylation: Efficient Synthesis of Indole- and Pyrrole-2-carboxylic Acid Esters
作者:Kang Zhao、Rongrong Du、Bingyang Wang、Jianhua Liu、Chungu Xia、Lei Yang
DOI:10.1021/acscatal.9b01193
日期:2019.6.7
The C2-selective C–H alkoxycarbonylation of indoles with alcohols and CO catalyzed by RhCl3·3H2O is disclosed that offers convenient access to diverse indole-2-carboxylic esters. The rhodium-based catalysts outperformed all other precious-metal catalysts investigated. In addition, this protocal was found applicable to the synthesis of pyrrole-2-carboxylic esters, and allowed the C–H alkoxycarbonylation
Palladium-Catalyzed Direct Alkoxycarbonylation of Aromatic CH Bonds<i>via</i>Selective CC Cleavage of α-Keto Esters
作者:Wei Zhou、Pinhua Li、Yicheng Zhang、Lei Wang
DOI:10.1002/adsc.201300436
日期:2013.8.12
AbstractA novel palladium‐catalyzed direct alkoxycarbonylation of 2‐arylpyridines, 2‐arylquinolines, benzo[h]quinolines, 2‐phenylpyrimidines, N‐pyrimidine pyrroles and N‐pyrimidine indoles via aromatic CH bond activation and selective CC cleavage of α‐keto esters has been developed. The method has the advantages of wide functional group tolerance, high selectivity, broad range of substrates and good yields.magnified image
Rhodium‐Catalyzed Additive‐Free C−H Ethoxycarbonylation of (Hetero)Arenes with Diethyl Dicarbonate as a CO Surrogate
as a CO-free and operationally simple protocol. In this reaction, stable and commercially available diethyl dicarbonate serves as a practical alkoxycarbonyl source, and only ethanol and CO2 were produced as byproducts. The utility of this protocol was demonstrated by a gram-scale reaction and the transformation of the ethyl ester moiety.
吲哚和芳基吡啶与二碳酸二乙酯的无添加剂乙氧基羰基化已被开发为无 CO 且操作简单的协议。在该反应中,稳定且可商购的二碳酸二乙酯作为实用的烷氧基羰基来源,并且仅产生乙醇和CO 2作为副产物。该协议的效用通过克级反应和乙酯部分的转化得到了证明。