Efficient synthesis of bis(indolyl)methanes catalyzed by TiCl₄

2393-2395TiCl4 is found to be an efficient catalyst for the electrophilic substitution reaction of indoles with aromatic aldehydes in dichloromethane to afford the corresponding bis(indolyl)methanes in excellent yields at ambient temperature

A mild and efficient method for tetrahydropyranylation and detetra­hydro­pyranylation of alcohols and phenols by BiOClO₄.xH₂O (or) BiONO₃

2396-2398A mild and efficient method for the protection of alcohols and phenols as tetrahydropyranyl ethers 3a-k and their deprotection at room temperature using BiOClO4.xH2O (or) BiONO3 as catalyst is described

Synthesis of 1-(6-Methylbenzofuran-2-yl)-3-aryl/[4-(β-substituted ethoxy)phenyl]propenones as Marked anti-Microbial Agents.

1079-10832-Acetyl-6-methylbenzofuran 1 has been synthesized under PTC conditions and conventional method (acetone/K2CO3). 1-(6-Methylbenzofuran-2-yl)-3-arylpropenones 3a-e and 1-(6-methylbenzofuran-2-yl)-3-[4-(β-substitutedethoxy) phenyl]­propenones 4a-e have also been synthesized. The compounds 3a-e and 4a-d have been screened for antibacterial and antifungal activities

Synthesis of 1-(6-methylbenzofuran-2-yl)-3-aryl/[4-(β-substitutedethoxy)phenyl]propenones as marked anti-microbial agents

1079-10832-Acetyl-6-methylbenzofuran 1 has been synthesized under PTC conditions and conventional method (acetone/K2CO3). 1-(6-Methylbenzofuran-2-yl)-3-arylpropenones 3a-e and 1-(6-methylbenzofuran-2-yl)-3-[4-(β-substitutedethoxy) phenyl]­propenones 4a-e have also been synthesized. The compounds 3a-e and 4a-d have been screened for antibacterial and antifungal activities

Synthesis of 2, 3-diphenyl-5-methyl-6-aroylbenzo[1,2-<i>b</i>:5,4-<i>b</i>']difurans under PTC conditions and their anti-microbial activity

479-4832, 3-Diphenyl-6-hydroxybenzofuran 1 and 2, 3-diphenyl-5-acetyl-6-hydroxybenzofuran 3 have been synthesized under microwave irradiation. 2,3-Diphenyl-5-acetyl-6-aroylbenzo[1 ,2-b:5,4-b']difurans 5a-h and 6a-e have been synthesized from the reaction of 3 and phenacyl bromides 4a-h under PTC conditions using TBAHS4 (Tetrabutylammonium hydrogen sulphate) as a catalyst in good yields. The compounds 5a-h and 6a-e have been screened for antibacterial and antifungal activities. Compounds 5b and 5e have shown maximum inhibitory activity against E. coli and S. aureus, while compounds 5b, 5e-g and 6a show maximum spore germination inhibition against Fusarium moniforme

Bismuth Oxide Perchlorate as a Highly Efficient and Chemoselective Catalyst for Thioacetalization of Carbonyl Compounds under Solvent-Free Conditions.

2387-2389Bismuth oxide perchlorate efficiently and chemoselectively catalyzes the thioacetalization of both aliphatic and aromatic carbonyl compounds under solvent-free conditions. Stearically hindered ketones are also thioacetalized in excellent yields with stoichiometric amounts of 1,3-propanedithiol at room temperature

Synthesis of benzo[b]furan Mannich bases under solventless, PTSA/PTC catalytic conditions assisted by microwave irradiation

1109-1111Condensation of 2-aroyl-6-hydroxy-3-methyl-5-acetyl-benzo­[b]­furan with different amines and paraformaldehyde in the presence of p-toluene sulfonic acid (PTSA) or PTC [tetra butyl ammonium sulphate] leads to the synthesis of benzo[b]furan Mannich bases by a solventless PTSA/PTC catalytic reaction under microwave irradiation

Synthesis of Benzo[b]furan Mannich Bases under Solventless, PTSA/PTC Catalytic Conditions Assisted by Microwave Irradiation.

1109-1111Condensation of 2-aroyl-6-hydroxy-3-methyl-5-acetyl-benzo­[b]­furan with different amines and paraformaldehyde in the presence of p-toluene sulfonic acid (PTSA) or PTC [tetra butyl ammonium sulphate] leads to the synthesis of benzo[b]furan Mannich bases by a solventless PTSA/PTC catalytic reaction under microwave irradiation

Bismuth oxide perchlorate as a highly efficient and chemoselective catalyst for thioacetalization of carbonyl compounds under solvent-free conditions

2387-2389Bismuth oxide perchlorate efficiently and chemoselectively catalyzes the thioacetalization of both aliphatic and aromatic carbonyl compounds under solvent-free conditions. Stearically hindered ketones are also thioacetalized in excellent yields with stoichiometric amounts of 1,3-propanedithiol at room temperature

Bismuth oxide perchlorate catalysed efficient synthesis of 3,4-dihydropyrimidin-2(1<i style="">H</i>)-ones: An improved high yielding protocol for the Biginelli reaction

1304-1306Dihydropyrimidines are prepared by a one-pot cyclo­con­densation of aldehydes, β-ketoesters and urea in acetonitrile by using bismuth oxide perchlorate as the catalyst for the first time is described. Compared to the classical Biginelli reaction conditions, this new method consistently has the advantage of excellent yields (85-95%) and short reaction time (2-4 hr) at lower temperature (40-50oC)