Triethylamine-bonded sulfonic acid ([Et<sub>3</sub>N–SO<sub>3</sub>H]Cl): a highly efficient and homogeneous catalyst for the condensation of 2-naphthol with arylaldehydes and amides (alkyl carbamates or thioamides)
Ionic liquid triethylamine-bonded sulfonic acid ([Et 3N–SO 3H]Cl, N,N-diethyl-N-sulfoethanammonium chloride) is utilized as a highly efficient, inexpensive and homogeneous catalyst to promote the following one-pot multi-component organic transformations under solvent-free conditions: (i) the condensation of 2-naphthol with arylaldehydes and amides leading to 1-amidoalkyl-2-naphthols, (ii) the reaction
Discovery of an in situ carbocationic system using trityl chloride as a homogeneous organocatalyst for the solvent-free condensation of β-naphthol with aldehydes and amides/thioamides/alkyl carbamates in neutral media
Trityl chloride (TrCl), efficiently catalyzes the one-pot multi-component condensation of β-naphthol with aromatic aldehydes and amides/thioamides/carbamates such as acetamide, benzamide, nicotinamide, thioacetamide, and methylcarbamate under solvent-free and neutral conditions to afford 1-amido-alkyl-2-naphthols, 1-thioamido-alkyl-2-naphthols, and 1-carbamato-alkyl-2-naphthols in high yields and very
β-Cyclodextrin-butane sulfonic acid: an efficient and reusable catalyst for the multicomponent synthesis of 1-amidoalkyl-2-naphthols under solvent-free conditions
A [small beta]-cyclodextrin-butane sulfonic acid is reported as an efficientcatalyst for the one-pot synthesis of 1-amidoalkyl-2-naphthols by the multicomponent condensation of aromatic aldehydes, [small beta]-naphthol and amides undersolvent-freeconditions. The...
Nano Silica Sulfuric Acid an Efficient and Recoverable Heterogeneous Catalyst for the Preparation of Amidoalkyl Naphthols Under Solvent-Free Conditions
An efficient and green method has been developed for the synthesis of amidoalkyl naphthol derivatives through a one-pot three-component condensation of 2-naphthol, aldehydes, and amide in the presence of nano silica sulfuricacid as heterogeneouscatalyst under solvent-free conditions.
Perchloric Acid–Silica (HClO4⋅SiO2)-Catalyzed Synthesis of 14-Alkyl- or 14-Aryl-14H-dibenzo[a,j]xanthenes andN-[(2-Hydroxynaphthalen-1-yl)methyl]amides
The synthesis of 14-aryl- or 14-alkyl-14H-dibenzo[a,j]xanthenes 3 involving the treatment of naphthalen-2-ol (1) with arenecarboxaldehydes or alkanals 2 in the presence of HClO4⋅SiO2 as a heterogeneous catalyst was achieved (Table 1), and this reaction was extended to the preparation of N-[(2-hydroxynaphthalen-1-yl)methyl]amides 5 by a three-component reaction with urea (4a) or an amide 4b–d as a third