Catalysis by basic carbons: Preparation of dihydropyridines

Control of amine functionality distribution in polyvinylamine/SBA-15 hybrid catalysts for Knoevenagel condensation

“…amine), followed by dehydration to yield α,β-unsaturated compounds. The products obtained by the Knoevenagel condensation are widely used in pharmaceutical, food and cosmetic industry [1][2][3]. On the other hand, the Knoevenagel condensation is often applied as a test reaction for probing the activity of solid base catalysts and measuring the total number of basic sites.…”

Nucleophilic, Heterocyclic, Carbene-Catalyzed, Solvent-Free, One-Pot Synthesis of Polyhydroquinolines via Multicomponent Hantzsch Reaction: An Efficient and Ecofriendly Approach

“…The plausible mechanistic pathway for the synthesis of product 4 is shown in Scheme 3. Identity of the products was confirmed by comparison of the physical and spectral data (IR and 1 H NMR) with those of the reported compounds [19][20][21][22][23][24][25][26][27][28][29][30] (see the supporting information).…”

“…The success of these calcium antagonists has led to the development of several novel synthetic strategies along with improved classical methods of preparation, which include the use of microwaves, [12,13] ionic liquids, [14] metal triflates, [15] solvent reflux at high temperature, [16] TMSCl-NaI, [17] InCl 3 , [18] I 2 , [19] SiO 2 =HClO 4 , [20] SiO 2 = NaHSO 4 , [21] ceric ammounium nitrate (CAN), [22] Na-and Cs-norit carbons, [23] tetrabutylammonium hydrogen sulfate, [24] fermenting Baker's yeast, [25] and application of organocatalysts, [26] solar thermochemical method, [27] potassium dodecatungstocobaltate trihydrate, [28] thiamine hydrochloride, [29] and triphenylphosphine. [30] However, conditions such as the use of high temperature, expensive metal precursors, and longer reaction time limit these methods to great extent.…”

Green and fast procedure to obtainN‐alkylbenzimidazole derivatives under microwave activation

“…Alkali carbons may also be appropriate solids to selectively catalyze basic reactions [13,14]. Carbon is known in microwave terminology as a very ''lossy'' material, a very efficient absorber of MW energy that converts energy to heat.…”