Heterocycle-containing macrocycles are an emerging class of molecules that have therapeutic efficacy. Many biologically active natural products that have interesting biological properties fall into this class of molecules. The highly specific and selective biological activity is often attributed to the unique conformation of these macrocycles, which is affected by the elements of the macrocycles as well as its surroundings in biological systems. In this review, the structure-activity relationship studies of several recently developed biologically active heterocycle-containing macrocycles have been discussed in order to facilitate an understanding on how unpredictable structures can be controlled.
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http://dx.doi.org/10.1016/j.bioorg.2015.04.009 | DOI Listing |
Chem Asian J
September 2024
Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India.
Macrocycles are essential in protein-protein interactions and the preferential intake of bioactive scaffolds. Macrocycles are commonly synthesized by late-stage macrolactonizations, macrolactamizations, transition metal-catalyzed ring-closing metathesis, S-S bond-forming reactions, and copper-catalyzed alkyne-azide cycloaddition. Recently, transition metal-catalyzed C-H activation strategies have gained significant interest among chemists to synthesize macrocycles.
View Article and Find Full Text PDFJ Med Chem
March 2024
Département de Pharmacologie-Physiologie, Institut de Pharmacologie de Sherbrooke, Université de Sherbrooke, 3001 12e ave Nord, Sherbrooke, QC J1H5N4, Canada.
Macrocycles have recognized therapeutic potential, but their limited cellular permeability can hinder their development as oral drugs. To better understand the structure-permeability relationship of heterocycle-containing, semipeptidic macrocycles, a library was synthesized. These compounds were created by developing two novel reactions described herein: the reduction of activated oximes by LiBH and the aqueous reductive mono--alkylation of aldehydes using catalytic SmI and stoichiometric Zn.
View Article and Find Full Text PDFJ Org Chem
March 2022
Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
Four different aromatic -substituted tellurophene-containing dithiasapphyrins were synthesized by acid-catalyzed [3+2] condensation of 16-telluratripyrrane with bithiophene diol in 22-23% yields. The structural, spectral, and electrochemical properties of tellura dithiasapphyrins were studied and compared with those of previously reported aza (pyrrole)- and other heterocycle (furan, thiophene, and selenophene)-containing dithiasapphyrins. Nuclear magnetic resonance studies indicated that the tellurophene ring in tellura dithiasapphyrins is in the normal conformation, facing toward the inner core, but flips in diprotonated derivatives to an inverted conformation, facing away from the macrocyclic core, unlike aza- and other heterocycle-containing dithiasapphyrins in which pyrrole and the corresponding heterocycle ring always prefer to be in inverted conformation in their neutral and protonated forms.
View Article and Find Full Text PDFChem Soc Rev
November 2021
National Institute of Science Education and Research Bhubaneswar, P.O. Jatni, Khurda 752050, Odisha, India.
Expanded heteroporphyrins are a class of porphyrin macrocycles containing pyrrole, thiophene, furan, selenophene and other heterocyclic rings that are connected to form an internal ring pathway containing a minimum of 17 atoms and more than 18 delocalized π electrons in their conjugated macrocyclic framework. Considering that expanded heteroporphyrins are large in size, these macrocycles are structurally flexible and prefer to adopt various conformations in which one or more pyrrole(s)/heterocycle(s) tend to be in an inverted conformation and pointed outward from the centre of the macrocyclic core. The inverted expanded heteroporphyrins are divided into two classes as follows: (1) -inverted expanded heteroporphyrins and (2) hetero-atom inverted expanded heteroporphyrins.
View Article and Find Full Text PDFJ Med Chem
December 2018
Department of Chemistry and Biochemistry , University of Arizona , 1306 E. University Boulevard, Tucson , Arizona 85721 , United States.
Oxygen heterocycles are the second most common type of heterocycles that appear as structural components of U.S. Food and Drug Administration (FDA) approved pharmaceuticals.
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