Regiocontrolled direct C4 and C2-methyl thiolation of indoles under rhodium-catalyzed mild conditions
作者:Saurabh Maity、Ujjwal Karmakar、Rajarshi Samanta
DOI:10.1039/c7cc07086a
日期:——
Rh(III)catalyzed general strategy was developed for the site selective remote C4 (sp2) and C2 (sp3)-methyl thiolation of indole core keeping the oxime directing group at the C3 position. The transformation was accomplished undermildconditions with wide scope and functional group tolerance. The directing group can easily be removed after operation. Methyl substitution at the C2 position of indole core
first Pd-catalyzed directC–Hacylation of indoles at the C4 position with α-oxocarboxylic acids using a ketone directinggroup is described. This reaction exhibits high regioselectivity with the tolerance of a wide scope of functional groups to afford diverse acylated indoles in moderate-to-good yields. The control experiments evidence the generation of acyl radicals via K2S2O8 promoted decarboxylation
描述了使用酮基直接基团的α-氧代羧酸在C4位上的Pd催化的第一个Pd的吲哚直接C–H酰化反应。该反应显示出高的区域选择性,并具有宽范围的官能团的耐受性,以中等至良好的产率提供了各种酰化的吲哚。对照实验证明了通过K 2 S 2 O 8促进α-氧代羧酸的脱羧作用以及Pd II / Pd IV催化循环的参与产生了酰基基团。重要的是,观察到的合成有用的选择性可用于制备具有抗肿瘤活性的吲哚衍生物作为微管蛋白抑制剂。
Rhodium(III)-Catalyzed Regioselective Direct C4-Alkylation and C2-Annulation of Indoles: Straightforward Access to Indolopyridone
作者:Aniruddha Biswas、Rajarshi Samanta
DOI:10.1002/ejoc.201701755
日期:2018.3.29
C4‐alkylation and C2‐annulation of indole derivative has been developed by using variable diazo esters. Fine tuning of the reactivity of diazo esters leads to control in regioselectivity with wide scope and functional‐group tolerance. A straightforward approach has been established to furnish an indolopyridone scaffold.
A carbon nitride supported copper nanoparticle composite: a heterogeneous catalyst for the N-arylation of hetero-aromatic compounds
作者:Debkumar Nandi、Samarjeet Siwal、Kaushik Mallick
DOI:10.1039/c6nj03584a
日期:——
nitride supported copper nanoparticle composite (Cu–gCN) has been found to be an active catalyst for the N-arylation of hetero-aromatic systems (pyrrole, pyrazole, and substituted indole) and benzamide molecules, with high product selectivity and good to excellent yields, using substituted aryl bromide as a coupling partner. The intercalated structure and the amine functional group of the carbon nitride
Acid-catalyzed acylation reaction via C–C bond cleavage: a facile and mechanistically defined approach to synthesize 3-acylindoles
作者:Qi Xing、Pan Li、Hui Lv、Rui Lang、Chungu Xia、Fuwei Li
DOI:10.1039/c4cc05047a
日期:——
A facile acid-catalyzed acylation of indoles with 1,3-dione as an eco-friendly acylating agent was developed. This protocol combines C-C bond cleavage and heterocyclic C-H bond functionalization to form new C-C bonds. Based on the detailed mechanistic studies, a credible mechanistic pathway was proposed.