Showing papers in "Synthetic Communications in 2007"

TL;DR: Diammonium hydrogen phosphate was used as a mild, efficient, neutral, and cheap catalyst for the synthesis of various 4H•benzo[b]pyran derivatives via a one-pot, three-component condensation of aromatic aldehydes, active methylene compounds, and dimedone in aqueous media as mentioned in this paper.

TL;DR: One-pot, three-component condensation of 2-naphthol, amides/ureas, and aldehydes takes place smoothly in the presence of cation exchange resins to afford the corresponding 1-amidoalkyl, 2-Naphthols in good yield as mentioned in this paper.

TL;DR: Proline was found to efficiently catalyze the one-pot condensation of aromatic aldehydes, malononitrile, and dimedone (1,3•cyclohexanedione or 3,methyl•1,phenyl•2,pyrazolin) as mentioned in this paper.

TL;DR: In this article, the selective reduction of aryl nitro compounds in the presence of sensitive functionalities, including halide, carbonyl, nitrile, and ester substituents, under ultrasonic irradiation at 35 kHz was reported in yields of 39-98%.

TL;DR: In this article, a new and efficient method to synthesize a 3,3,6, 6,9,aryl, 1,8,dioxo-octahydroxanthene derivative using diammonium hydrogen phosphate as catalyst was performed in water at room temperature in a short periods.

TL;DR: In this paper, an improved, mild procedure for the CuI−catalyzed coupling reactions of aryl iodides with aliphatic and aromatic thiols, using L ‐proline as the ligand, is reported.

TL;DR: In this article, an iodine/DMSO system was introduced as an excellent catalyst in three-component coupling reactions of tetrahydrobenzo[b]pyran synthesis.

TL;DR: An ultrasound-accelerated fast and efficient three-component reaction for the regioselective synthesis of l,4disubstituted 1,2,3 triazoles using different alkyl and allyl halides, terminal alkynes, and sodium azide in water at room temperature has been developed using CuI as catalyst.

TL;DR: In this article, a facile route for mono-BOC protection of symmetrical and unsymmetrical diamines was developed by sequential additions of 1 mol of HCl and 1mol of (BOC)2O followed by neutralization.

TL;DR: In this article, a procedure for the synthesis of geminal bishydroperoxides by the sulfuric acid-catalyzed reaction of ketones with hydrogen peroxide in THF was developed.

TL;DR: The use of microwave irradiation in the synthesis of arylidenemalononitrile and benzopyran derivatives in water without catalyst is a clean method with high yield as discussed by the authors.

TL;DR: In this article, a three-component condensation of isatoic anhydride, a primary amine, and an aldehyde catalyzed by Amberlyst-15 in the presence of microwaves under neat conditions was presented.

TL;DR: In this article, a rapid and facile method for the conversion of primary amides to nitriles using inexpensive and readily available ZnCl2 in aqueous acetonitrile and their regeneration using ZnCL2−H2O−THF in the presence of acetamide under microwave irradiation in good yields is reported.

TL;DR: In this article, pyrazoles with N−halosuccinimides (NXS, X=Br, Cl) in either CCl4 or water gave 4−halopyrazoles in excellent yields.

TL;DR: A series of 2.5 and 6 position substituents (H, CH3, CF3) were synthesized via microwave irradiation using a short synthetic route and Na2S2O5 as oxidant as discussed by the authors.

TL;DR: Some substituted 2-amino-2-chromenes were synthesized by the reaction of arylidenemalonononitriles with 1-naphthol or 2-anthophthol in the presence of sodium hydroxide as catalyst under solvent-free condition as discussed by the authors.

TL;DR: In this paper, 1,5-benzodiazepine and quinoxaline derivatives have been synthesized in water with excellent yields using a catalytic amount of indium chloride at room temperature.

TL;DR: The catalytic oxidative cyclocondensation of oaminophenols was investigated in this paper, where the oxidants used were air/laccase, horseradish peroxidase, H2O2/ebselen, and TBHP/diphenyl diselenide 4.

TL;DR: An alternative method for the synthesis of 3-substituted isocoumarins from homophthalic acid and ester is described in this paper, where the synthesis process is described as follows

TL;DR: In this article, simple N-heterocycles were converted to N-phosphono- and phosphinoxidomethyl derivatives by a solvent-free microwave assisted condensation of the heterocycle, paraformaldehyde, and diethylphosphite or diphenyl phosphine oxide in a convenient and efficient way.

TL;DR: In this paper, an efficient and general method for palladium free copper-catalyzed crosscoupling reactions of aryl iodides and terminal acetylenes under microwave irradiation in water, producing various alkynes in excellent yields.

TL;DR: In this article, the α-monohalogenation of various carbonyl compounds such as β-keto-esters, cyclic ketones, and lactams with N−halosuccinamides (NBS, NCS, NIS) in the presence of DMSO was described.

TL;DR: An efficient microwave irradiation synthesis of 2-substituted benzimidazoles in one step via the Na2S2O4 reduction of o−nitroanilines in the presence of aldehydes is described in this article.

TL;DR: In this paper, a method for Knoevenagel condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate was developed using the inexpensive and environmentally friendly reagent I2/K2CO3 at room temperature.

TL;DR: In this article, an environmentally friendly three-component condensation reaction of an activated C-H acid, an aldehyde, and alkyl nitriles to afford the corresponding pyran annulated heterocyclic systems in water in good yields, avoiding the addition of any catalyst, is reported.

TL;DR: In this article, a series of spirooxindolonitro pyrrolizidines and spiroindanonitro polycycloadducts were synthesized from isatin and ninhydrin with proline.

TL;DR: In this paper, a convenient one-pot synthesis of 4-hydroxy, 2-methyl, 1-2-benzothiazine, and 1-1-dioxide was reported.

TL;DR: The Biginelli reaction is performed in an efficient, simple, solvent-free procedure, using a small amount of H6P2W18O62·24H2O, a reusable heteropolyacid catalyst with Wells-Dawson structure as discussed by the authors.

TL;DR: In this article, a simple, efficient, and practical procedure for synthesis of 2,4,5,trisubstituted 1Himidazoles via the condensation of benzoin or acetoin, aromatic aldehydes, and ammonium acetate using europium triflate [Eu(OTf)3] as a novel catalyst in high yields is described.

TL;DR: Triflouroacetic acid efficiently catalyzed the Friedlander synthesis of quinolines through a condensation reaction of an 2-aminoaryl ketone with an activated α-CH acid such as cyclic or acyclic β-dicarbonyl or cyclic ketone compounds under solvent-free conditions with high yields within several minutes as discussed by the authors.