Radical-mediated intramolecular [3-atom + 2-atom] addition and the synthesis of (.+-.)-rocaglamide: model studies
摘要:
The cyclopenta[b]benzofuran ring system of the antileukemic natural product rocaglamide can be efficiently prepared by intramolecular [3 + 2] radical mediated addition. The stereochemical relationship that emerges between C(2) and C(3a) upon cyclization is identical with that seen in the natural product.
Direct esterification of carboxylicacids with arylboronic acids has been successfully developed employing methyl propiolate as an activating reagent. This transformation was performed through a process of enol ester intermediate‐induced metal‐free oxidative coupling. Metal‐free, simple operation, good functional group tolerance, all of these indicate that this method is an adoptable approach for the
A simple and direct aerobic oxidativeesterification reaction of arylacetonitriles with alcohols/phenols is achieved in the presence of a copper salt and molecular oxygen, which produces a broad range of aryl carboxylic acid esters in good to high yields. Copper salt plays multiple roles in the transformation, which allows the oxygenation of CH bond, cleavage of inert CC bond, and formation of CO
Synthesis, characterization, docking study and antimicrobial activity of 2-(4-benzoylphenoxy)-1-[2-(1-methyl-1H-indol-3-yl)methyl)-1H-benzo[d]imidazol-1-yl] ethanone derivatives
作者:T. Prashanth、V. Lakshmi Ranganatha、Ramith Ramu、Subhankar P. Mandal、C. Mallikarjunaswamy、Shaukath Ara Khanum
DOI:10.1007/s13738-021-02230-y
日期:2021.10
most important frameworks in the discovery of innovative drugs. In this present study, we have described a detailed synthesis and structural elucidation of new benzimidazole bridged benzophenone substituted indole scaffolds 11a–k. Further, all the newly synthesized compounds were tested for in vitro antimicrobialactivity by disk diffusion and serial dilution method and the compounds 11b, 11e, 11f and
A new, non‐symmetrical copper(II) pincercomplex catalyzes much more efficiently the formation of benzofuran by the reaction between ortho‐iodophenols and alkynes. The lowest catalyst loadings are realized for this reaction, and bromo‐ and chlorophenols are heteroannulated for the first time. Strong evidence for hydrophenoxylation and intramolecular halogen atom‐transfer steps catalyzed by this remarkably
Tropolonate Salts as Acyl-Transfer Catalysts under Thermal and Photochemical Conditions: Reaction Scope and Mechanistic Insights
作者:Demelza J. M. Lyons、Claire Empel、Domenic P. Pace、An H. Dinh、Binh Khanh Mai、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1021/acscatal.0c03702
日期:2020.11.6
strong nucleophilicity and photochemical activity, can promote the coupling reaction between alcohols and carboxylic acid anhydrides or chlorides to give products under thermal or blue light photochemical conditions. Kinetic studies and density functional theory calculations suggest interesting mechanistic insights for reactions promoted by this acyl-transfer catalytic system.