Letters in Organic Chemistry - Volume 15, Issue 7, 2018

Background: 6-Fluoro-3-(4H-1,2,4-triazol-3-yl)quinolin-4(1H)-ones are potential antileukemic agents. Method: QSAR analysis of a series of previously synthesized 6-fluoro-3-(4H- 1,2,4-triazol-3-yl)quinolin- 4(1H)-ones (tested for their inhibitory activity against blood cancer) as analogues of fluoroquinolone, was performed with the aid of multiple regression analysis. This could facilitate the exploration of features responsible f Read More

A Rice Husk based nanosilica anchored Ru(III) Schiff-base complex was found to be a very efficient and reusable heterogeneous catalyst for organic transformation of alcohol to carbonyl compounds. The catalyst was obtained by simple Schiff-base condensation between 3-aminopropyltriethoxysilane (APTES) functionalized nanosilica and acetamide. The characterization of the catalyst was carried out by vari Read More

An efficient and convenient substitution protocol was developed for the synthesis of novel benzyl (1-methyl-1H-imidazol-5-yl) (aryl) methyl carbamate derivatives from α-amido sulphones with a solution 5-bromo-1-methyl-(1H)-imidazole in THF under Hexamethylphosphoramide (HMPA) and t-BuLi medium at -78°C to room temperature. The reactions were monitored with TLC for about 3-4 h. The yields obtained were als Read More

Background: In the present study, fourteen new 1,2,4-triazole Schiff bases and eight new 1,2,4-triazolo[3,4-b][1,3,4]thiadiazines incorporating a pyrimidine ring were synthesized and evaluated for their antibacterial activity. Methods: 1,2,4-Triazole Schiff bases were prepared from the condensation of 4-amino-3-mercapto-5- (2-thiomethylpyrimidyl)-1,2,4-triazole with a series of arylaldehydes in the presence of (+)-tarta Read More

We have developed a new chromium based reagent ‘DABCO−bis-CC' for the straightforward oxidation of alcohols to corresponding carbonyl compounds with high efficiency. The present results demonstrate a broad range of alcohols including primary, secondary, aliphatic, benzylic and heterocyclic alcohols are tolerated as substrates at room temperature.

CuFe2O4 nanoparticles were prepared by co-precipitation method. After the characterization of nanoparticles by XRD, SEM, EDS and TEM, their catalyst activity was investigated in the synthesis of β-acetamido ketones. CuFe2O4 nanoparticles were introduced as a recyclable, inexpensive and nontoxic catalyst in a four-component reaction of aromatic aldehydes, enolizable aromatic ketones, acetyl chloride and acetonitrile at ro Read More

Transition metal-free synthesis of synthetically valuable aryl iodides from aryl diazofluroborates in water under mild conditions has been described. Majority of synthesized aryl iodides are obtained in quantitative yields (>99 %) under present reaction conditions. The structural effects due to the substituents present on aryl diazofluoroborates did not show any satisfactory effect on the yields of the aryl iodides. Hence, the method Read More

An efficient Amberlite IRA-400 Cl resin catalyzed, solvent-free, one-pot synthesis of 1- aryl-1,2-dihydro-3H-naphtho[1,2-e][1,3]oxazin-3-ones via three-component reaction of arylaldehydes, urea, and β-naphthol are described. This method offers advantages such as easy work-up, low environmental impact, shortened reaction times, and high yields. The catalyst recovered was reused four times without significant loss o Read More

Background: The presence of bicyclic lactams is reflected in various pharmaceuticals, natural products, agrochemicals and active components of various dyes. Nowadays, to see the increasing rate of antimicrobial resistance and high incidence of microbial infections, there is a strong need to develop novel antimicrobial agents. In this study, we synthesized some benzofused six membered ring lactams and their alkyl derivative Read More

Background: The GlcNAc related sulfated disaccharides were reported to show inhibitory activity on breast tumor cells (MDA-MB-231). However, synthesis of sulfated disaccharides is laborious and time consuming, and there is a need to find more efficient methods to generate the sulfated disaccharide libraries in acceptable ratios and in respectable yields. Random glycosylation followed by sulfation may be a good method t Read More

Synthesis of seven odorant Schiff bases of methylanthranilate, an aroma constituent of blossom essential oils, with naturally occurring carbonyl compounds (citral, citronellal, cuminaldehyde, vanillin, veratraldehyde, acetophenone and α-ionone) employing conventional and microwave irradiation methods was carried out. Elemental and spectral (FT-IR, 1H NMR and 13C NMR) analysis of these compounds supported their Read More

A non-metal catalytic method for the aerobic conversion of primary alcohols to aromatic nitriles via a single-step operation was developed. A series of primary benzyl alcohols underwent this transformation to give the targeted products in moderate to high yields under the catalysis of TEMPO/ HNO3.

In the present study a series of metal complex of [bis (2-amino-5-aryl-1,3,4-thiadiazole]2Cl (S1-S9) was synthesized by using ultrasound irradiation technique. The metal complex was synthesized by the reaction between ligand and appropriate metal salts (CuCl2. 2H2O, CoCl2. 6H2O, ZnCl2, MgCl2. 4H2O, NiCl2. 6H2O). The products were obtained in high yield and the reaction time was found to be shorter. The synthesized me Read More