Résumé Organocatalyst trityl chloride (Ph3CCl), by in situ formation of trityl carbocation with inherent instability, efficiently promotes the cross-aldol condensation reaction between cycloalkanones and arylaldehydes in solvent-free and homogeneous media to afford α,α′-bis(arylidene)cycloalkanones in high yields. Moreover, an attractive and plausible mechanism based on observations and the literature is proposed for the reaction.
a recyclable and highly efficient organic base catalyst for the aldol condensation of furfural with carbonylcompounds, and the selectivity of mono- or difuryl product can be easily regulated by adjusting the molar ratio of substrates. By means of flow technique, a shorter reaction time, satisfactory output, and continuous preparation are achieved under the present procedure, representing a significant
Sulfuric Acid-modified PEG-6000 (PEG-SO<sub>3</sub>H): An Efficient, Bio-degradable and Reusable Catalyst for Synthesis of &alpha;, &alpha;' bis(arylidene) Cycloalkanones Under Solvent-free Conditions
作者:Mohammad A. Nasseri、Mehri Salimi
DOI:10.2174/1570178611310030004
日期:2013.4.1
A green and efficient method for synthesis of α,α' -bis (arylidene) cycloalkanones, starting from aromatic aldehydes in reaction with ketones using sulfonated polyethylene glycol 6000 (PEG-SO3H) as a stable, reusable and biodegradable catalyst under solvent-free conditions at 80 °C is described. The use of a nontoxic, inexpensive, easily available and recyclable catalyst makes this protocol practical
strains P. falciparum Dd2, IC50 1 µM (Ib) and 2.7 µM (Id)} and PfINDO IC50 1.1 µM (Ib) and 2.5 µM (Id)}. Drug exposure followed by drug withdrawal-based stage-specific kill kinetic studies showed that Ib is shizonticidal within 3h while the earliest killing actions against Trophozoites and Rings were seen at >3h and >6 h, respectively. Combination studies of the most potent leads viz. Ib and Id showed
Methods of synthesis of alicyclic 1,5,9-triketones. Reaction of transaminomethylation
作者:T. I. Akimova、O. A. Soldatkina、Zh. A. Ivanenko、V. G. Savchenko
DOI:10.1134/s1070428017050128
日期:2017.5
Alicyclic 1,5,9-triketones with various combination of 5-, 6-, 7-membereded cycles in the molecule were obtained by methods of diketone condensation, Michael reaction, and proceeding from Mannich mono- and bisbases and cycloalkanones. The latter method was accompanied with a transaminomethylation, observed for the first time at triketones preparation. The structures of cyclic forms of Michael reaction