Synthesis and biological activities of [E]-5-(2-acylvinyl)uracils
摘要:
The synthesis of a number of 5-substituted uracils, eg [E]-5-(2-acylvinyl)uracils 8a-8g is described. These compounds were found to have cytotoxic activities against CCRF-CEM human lymphoblastoid cells, HT-29 colon carcinoma cells and L1210/0 mouse leukemia cells. These compounds were also found to inhibit thymidylate synthase.
metal-free reaction condition. Various aryl ketone derivatives react readily with DMSO, producing the α,β-unsaturatedcarbonylcompounds in yields of 42 to 90%. This method features a transition metal-free reaction condition, wide substrate scope and using DMSO as novel one-carbon source to form C═C bond, thus providing an efficient and expeditious approach to an important class of α,β-unsaturated carbonyl
Photocatalytic C(
<i>sp</i>
<sup>3</sup>
)−H Activation towards α‐methylenation of Ketones using MeOH as 1 C Source Steering Reagent
作者:Fooleswar Verma、Prashant Shukla、Smita R. Bhardiya、Manorama Singh、Ankita Rai、Vijai K. Rai
DOI:10.1002/adsc.201801431
日期:2019.3.15
direct access to terminal enones via α‐methylenation of aryl ketones to form C=C bond is achieved under visible‐light conditions using methanol as one carbon source substrate and solvent as well. The reaction involves Cu@g‐C3N4‐catalysed in situ oxidation of methanol into formaldehyde followed by dehydrative cross aldol type reaction. Various aryl ketones react efficiently with MeOH, producing α,β‐unsaturated
Palladium-catalyzed regioselective synthesis of B(4,5)- or B(4)-substituted <i>o</i>-carboranes containing α,β-unsaturated carbonyls
作者:Chuyi Zhang、Qian Wang、Song Tian、Jianwei Zhang、Jiaoyi Li、Ling Zhou、Jian Lu
DOI:10.1039/d0ob00698j
日期:——
With the help of a carboxylic acid directing group, Pd-catalyzed regioselective synthesis of B(4,5)- or B(4)-substituted o-carboranes containingα,β-unsaturated carbonyls has been reported. The –COOH, removed during the course of the reaction, is responsible for controlling the regioselectivity. The desired products could be obtained in moderate to good yields.
We evaluated the influence of solvent on the alumina‐promoted C3‐alkylation of indoles with α,β‐unsaturatedketones. We found that lipophilic solvents were generally superior to hydrophilic ones with hexanes offering the 3‐alkyl indole products in high yields. Thus, we demonstrate an inexpensive and procedurally simple new process that pairs acidic alumina with hexanes to achieve this important Michael
A copper-catalyzed asymmetrichydrosilylation of β-nitroethyl aryl ketones has been disclosed, and the corresponding chiral alcohols could be obtained in high yields (up to 99% yield) and excellent enantioselectivities (up to 96% ee). Moreover, the reaction worked well on a gram scale with 0.3 mol % of ligand loading, indicating that our protocol has potential applications in the synthesis of important