Letters in Organic Chemistry - Volume 13, Issue 10, 2016

Background: Despite the large number of publications in the synthesis of heterocyclic compounds based on unsaturated lactones, there are no systematic and modern data's on 3-arylmethylidene- 3H-furan-2-ones. These compounds are convenient starting materials for the synthesis of azaheterocycles and are of independent interest as biologically active compounds. This review examines the interaction of (3H) furan-2- Read More

Background: We have developed a one-pot, simple and efficient protocol for the direct synthesis of symmetrical organic disulfides in high yields via domino reaction between aryl/alkyl halides and Sodium thiosulfate as the sulfur source, in the presence of copper/imidazole and K2CO3. Methods: Owing to the importance seen in the synthesis disulfides, as is evident from the number of publications in the recent past, and our conti Read More

Background: Steroidal ribbons (or steroid containing ribbons) are being studied for several reasons, firstly, they may be included in the lipid bilayer, especially if they have suitable size (as “extended cholesterol”), and they are interesting in binding to steroidal receptors, gelators, and/or superassembly synthons. Bile acids seem to be very suitable as their components have natural tendency to form supramolecular assem Read More

Background: In this work a few approaches for the synthesis of 4,4-difluoro-8-(4’- carboxyphenyl)-4-bora-3a,4a-diaza-s-indacene are considered. The process of obtaining this boron fluoride complex involves the following stages: introduction of the protective group (methoxy-, 1’- pyrrolidine-2,5-dion-, trichloroethoxy-) on the carboxy-group of 4-formylbenzoic acid, condensation with pyrrole, removal of protection, oxidation, a Read More

Background: During the last years, condensed pyrimidine compounds have received much attention because of their immense biological properties. These compounds have gained too much interest as proven by large number of reviews and research articles published in the current years. The aim of this manuscript is to develop a one pot reaction for the synthesis of benzothiazole coupled pyrimidine compounds usin Read More

Background: An expeditious approach has been developed for the synthesis of two distinct classes of benzopyrones viz. flavones and coumarins under solvent-free conditions. L-Ascorbic acid was found to be an effective promoter under microwave irradiation and conventional heating. Various benzo-α-pyrones and benzo-γ-pyrones were synthesized with overall good yields. The present protocol is highly facile and needs Read More

Background: A green path for the synthesis of 3-aryl-1-phenyl-4-(4,5-diphenyl-1H-imidazol-2-yl)-1Hpyrazole derivatives using [BMIM][BF4] as a catalyst and green methods such as ultrasound and microwave irradiation is discussed in this paper. The titled compounds were obtained by the multi-component condensation of various 3-aryl-1-phenyl-1H-pyrazole-4-carboxaldehydes, benzil and ammonium acetate. One pot synt Read More

Background: Sulfoxides and sulfones have been in the center of attention due to their wide range of promises in various approaches. The functional groups presented in these compounds serve as important building blocks in numerous natural, pharmeceutical and agricultural compounds. These deriatives have been prepared through a multitude of routes which were accompanied by several drawbacks. Therefore, there has bee Read More

Background: Nitrosocarbonyl intermediates are fleeting compounds obtainable from the periodate oxidation of hydroxamic acids and easily trapped with dienes and alkenes to give the products of hetero Diels-Alder and ene reactions in high yields. Methods: A fleeting heterocyclic nitrosocarbonyl derived from the corresponding nitrile oxide is at work in a short-cut synthesis of 4-bromo-N-[(1R*,4S*)-4-hydroxy-2-cycl Read More

Background: As the phenols and its derivatives are considered as versatile precursors, herbicides, drugs and antioxidants, the synthesis of phenols has been gaining much attention during the last decades. Despite the numerous methods for phenol synthesis there is a serious need for “green” protocols with greater environmental benign and economic viability. Method: We used a highly abundant and inexpensive natural feedst Read More

Background: We synthesized two new organic chelating agents, such as 2-thiophene carboxaldehyde-4- phenylthiosemicarbazone (TCPTSC) and 4-methylbenzaldehyde-4-phenylthiosemicarbazone (MBP TSC) and applied to chelation with Cd(II). Both the ligands (TCPTSC and MBPTSC) their Cd(II) complexes [(Cd-(TCPTSC-H)2) and (Cd-(MBPTSC-H)2)] are characterized by molar conductivity measurements, elemental analysis, FT-IR, Read More