functionalized N-amino-3-nitrile-indole derivatives are obtained via an intramolecular hetero-cyclization of 2-aryl-3-substituted hydrazono-alkylnitriles using FeBr3 as a single electron oxidant. This approach allows the N-moiety on the side-chain to be annulated to the benzene ring during the final synthetic step via direct oxidative aromatic C–N bond formation.
Amine Directed Pd(II)-Catalyzed C–H Activation-Intramolecular Amination of <i>N</i>-Het(aryl)/Acyl Enaminonitriles and Enaminones: An Approach towards Multisubstituted Indoles and Heterofused Pyrroles
作者:Somaraju Yugandar、Saidulu Konda、Hiriyakkanavar Ila
DOI:10.1021/acs.joc.5b02902
日期:2016.3.4
of either palladium acetate/cupric acetate catalytic system under oxygen atmosphere or palladium acetate/silver carbonate in the presence of pivalic acid as additive. The method is compatible with a diverse range of substituents on the aryl ring as well as at the 2- and 3-positions of the indole ring. The versatility of this method was further demonstrated by elaborating it for the synthesis of heterofused
通过分子内氧化C–H活化胺化现有的2-(杂)芳基-3-(杂)芳基/烷基-3-(杂)芳基/酰基氨基丙烯腈/烯胺酮前体,开发了一种多取代吲哚的有效途径。在氧气气氛下存在乙酸钯/乙酸铜催化体系,或在新戊酸作为添加剂的情况下存在乙酸钯/碳酸银。该方法与芳基环以及吲哚环的2-和3-位上的各种取代基兼容。详细说明了该方法的多功能性,可用于合成杂稠稠合的吡咯,如噻吩并[2,3- b ]吡咯,噻吩并[3,2- b ]吡咯,吡咯并[2,3- b ]吲哚和pyrrolo [2,3-b ]吡啶,收率高。已经提出了形成这些吲哚的可能机理。
Enantioselective Construction of Aryl-Substituted All-Carbon Quaternary Stereocenters by Using Tertiary Amine-Thiourea-Catalyzed Michael Additions
A catalytic enantioselective synthetic strategy for the aryl-substituted all-carbon quaternary stereocenters of bioactive hydrodibenzofuran alkaloids was achieved by the Michael addition reaction of α-cyano ketones and acrylates using a chiral tertiary amine–thiourea catalyst. This method can tolerate steric bulkiness and multiple functional groups, and 32 Michael adducts were prepared in good to excellent
An expeditious method to synthesize difluoroboron complexes of β-keto amides from β-keto nitriles and BF<sub>3</sub>·OEt<sub>2</sub>
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1039/c7ob01356f
日期:——
synthesize difluoroboron complexes of β-keto amides has been developed fromβ-ketonitriles and BF3·OEt2. BF3·OEt2 serves as both a BF2 source and a Lewis acid catalyst in the synthetic strategy. The formation mechanism of the difluoroboron complexes fromβ-ketonitriles and BF3·OEt2 was proposed. The difluoroboron complexes can be further converted into β-keto amides by treatment with sodium acetate