Current Organic Synthesis - Volume 11, Issue 1, 2014

Porphyrin macrocycles have been the subject of intense study in the last century because they are widely distributed in nature, usually as metal complexes of either iron or magnesium. As such, they serve as the prosthetic groups in a wide variety of primary metabolites, such as hemoglobins, myoglobins, cytochromes, catalases, peroxidases, chlorophylls, and bacteriochlorophylls; these compounds have multiple Read More

The development of efficient synthetic methodologies and post-functionalization procedures gave access to a wide variety of new corrole derivatives with potential applications in different areas. This paper reviews the preparation of meso-triaarylcorroles and their functionalization, namely via cycloaddition transformations, and describes the nonlinear optical (NLO) properties of a series of metal-free and gallium corr Read More

Chlorin derivatives have attracted considerable attention over the last three decades in different scientific fields. These compounds are present in a large number of bacteria, fungi and in all plants found on Earth. Since the discovery of these pigments, chemists, biologists, medical professionals and materials scientists have devoted pronounced efforts in order to develop new synthetic methods and discover useful applications fo Read More

Methods for the synthesis of mono-, di-, and tetra-glycosylated phthalonitriles are described, which are key building blocks for the preparation of the corresponding glycosylated metal (mostly zinc) phthalocyanines. Than the preparation of symmetrically and unsymmetrically tetra- and octa-glycosylated zinc phthalocyanines in which the carbohydrate is attached either anomerically or via another one of its OH-groups to the p Read More

Metalloporphyrins effectively catalyze C-H bond functionalization, including C-O (hydroxylation), C-N (amination), and C-C bond formation (carbene insertion). Over the last 20 years, numerous papers have reported that these complexes display catalytic efficiency and selectivity (regioselectivity and enantioselectivity) in solution (homogeneous catalysis). Green chemistry advocates idealization and production of more efficient, sel Read More

This paper describes past and current microwave-assisted methodologies for the synthesis of porphryins and porphyrin derivatives, including porphyrin precursors such as dipyrromethanes. The review is organized in two main topics, porphyrin synthesis and porphyrin reactivity under microwave irradiation and covers solventless and solution reactions.

In medical applications such as drug delivery, gene transfection and imaging the formation of systems with well-defined sizes and shapes are of significant interest. For this reason the design of dendrimers with modulated size, shape, branching length/density, and their surface functionality, clearly distinguishes these structures as unique and optimum carriers for medical applications. The bioactive agents may be encapsulat Read More

The field of imaging science is growing immensely, with the emergence of “noninvasive” in vivo imaging technologies and imaging probes like Positron Emission Tomography (PET), Fluorescence Imaging (FI) and Magnetic Resonance Imaging (MRI), to observe events at molecular and cellular levels, and consequently to speed up drug development processes. For instance, the imaging of cancer specific molecular target Read More

The electrochemical synthesis of o-benzoquinones and their in situ transformation is a versatile approach for the synthesis of polyhydroxylated aromatics. In the present paper, the electrochemical oxidation of catechol in the presence of ketene N,S-acetals as N,Cdoubly nucleophiles was first investigated using cyclic voltammetry technique. Then preparative scale of electrolysis was carried out to demonstrate that polyfunction Read More

In this paper, we present for the first time the synthesis in satisfactory yields and characterization of a new family of five Npolyetheralkyl- 3,5-pyrazole derived ligands (L1-L5) as well as regioselectivity studies by NMR techniques. Ligands L1, L2, L3/3’, and L4/4’ were obtained by N-alkylation reaction, whereas for L5 O-alkylation reaction was followed. In N-alkylation, the alkylating agent was 1-chloro-2-[2-(2-methoxyethoxy)eth Read More

Tert-butylnitrite was proved to be an efficient oxidant for the selective oxidation of sulfides to sulfoxides. The reaction was promoted by Fe(NO3)3·9H2O under mild conditions and various substrates were effectively converted into the corresponding sulfoxides in good yields and excellent selectivity.

The addition of dialkyl phosphites or diphenylphosphine oxide to the triple bond of dialkyl acetylenedicarboxylate may result in mono- and/or bisadducts. The ratio of the products may be influenced by the molar ratio of the reactants and the conditions (temperature of microwave irradiation and reaction time). Stereospecific 3JPP couplings were utilized in the assignments to the meso and racemic forms of the bisa Read More