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Synthesis of Cyclobutane Analogue 4: Preparation of Purine and Pyrimidine Carbocyclic Nucleoside Derivatives. 2019

Noha Hasaneen, and Abdelaziz Ebead, and Murtaza Hassan, and Hanan Afifi, and Howard Hunter, and Edward Lee-Ruff, and Nadia S El-Gohary, and Azza R Maarouf, and Ali A El-Emam
Department of Chemistry, Faculty of Science, York University, Toronto, ON M3J 1P3, Canada.

The coupling of 2-bromo-3-benzoyloxycyclobutanone with purine under basic conditions produces two regioisomers consisting of the N-7 and N-9 alkylated products in equal amounts in their racemic forms. The distribution of the isomers is consistent with the charge delocalization between the N-7 and N-9 positions of the purinyl anion. The structural assignments and relative stereochemistry of each regioisomer were based on 1 and 2D NMR techniques. The relative stereochemistry of the C-2 and C-3 substituents in each regioisomer was the trans orientation consistent with steric factors in the coupling step. The N-9 regioisomer was reduced with sodium borohydride to give the all trans cyclobutanol as the major product in a stereoselective manner. The alcohol was debenzoylated with sodium methoxide in a transesterification step to give the nucleoside analogue. The regioisomeric pyrimidine nucleosides were prepared by Vorbrüggen coupling of the 3-hydroxymethylcyclobutanone triflate with either thymine or uracil followed by stereoselective hydride addition. Regiospecificity of the coupling at the N-1 position was observed and stereoselective reduction to the trans-disubstituted cyclobutanol structure assignments was based on NMR data.

UI MeSH Term Description Entries
D009682 Magnetic Resonance Spectroscopy Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING). In Vivo NMR Spectroscopy,MR Spectroscopy,Magnetic Resonance,NMR Spectroscopy,NMR Spectroscopy, In Vivo,Nuclear Magnetic Resonance,Spectroscopy, Magnetic Resonance,Spectroscopy, NMR,Spectroscopy, Nuclear Magnetic Resonance,Magnetic Resonance Spectroscopies,Magnetic Resonance, Nuclear,NMR Spectroscopies,Resonance Spectroscopy, Magnetic,Resonance, Magnetic,Resonance, Nuclear Magnetic,Spectroscopies, NMR,Spectroscopy, MR
D011687 Purines A series of heterocyclic compounds that are variously substituted in nature and are known also as purine bases. They include ADENINE and GUANINE, constituents of nucleic acids, as well as many alkaloids such as CAFFEINE and THEOPHYLLINE. Uric acid is the metabolic end product of purine metabolism.
D011741 Pyrimidine Nucleosides Pyrimidines with a RIBOSE attached that can be phosphorylated to PYRIMIDINE NUCLEOTIDES. Nucleosides, Pyrimidine
D003503 Cyclobutanes Four carbon cycloparaffin cyclobutane (the structural formula (CH2)4) and its derivatives.
D013237 Stereoisomerism The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed) Molecular Stereochemistry,Stereoisomers,Stereochemistry, Molecular,Stereoisomer
D015394 Molecular Structure The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds. Structure, Molecular,Molecular Structures,Structures, Molecular
D060326 Chemistry Techniques, Synthetic Methods used for the chemical synthesis of compounds. Included under this heading are laboratory methods used to synthesize a variety of chemicals and drugs. Inorganic Synthesis,Inorganic Synthesis Methods,Inorganic Synthesis Techniques,Methods of Inorganic Synthesis,Methods of Organic Synthesis,Methods of Peptide Synthesis,Organic Synthesis,Organic Synthesis Methods,Organic Synthesis Techniques,Peptide Synthesis Methods,Peptide Synthesis Techniques,Peptide Synthesis, Synthetic,Synthetic Chemistry Techniques,Synthetic Peptide Synthesis,Chemistry Technique, Synthetic,Inorganic Syntheses,Inorganic Synthesis Method,Inorganic Synthesis Technique,Method, Inorganic Synthesis,Method, Organic Synthesis,Method, Peptide Synthesis,Methods, Inorganic Synthesis,Methods, Organic Synthesis,Methods, Peptide Synthesis,Organic Syntheses,Organic Synthesis Technique,Peptide Syntheses, Synthetic,Peptide Synthesis Method,Peptide Synthesis Technique,Syntheses, Inorganic,Syntheses, Organic,Syntheses, Synthetic Peptide,Synthesis Method, Inorganic,Synthesis Method, Peptide,Synthesis Methods, Inorganic,Synthesis Methods, Peptide,Synthesis Technique, Inorganic,Synthesis Technique, Organic,Synthesis Technique, Peptide,Synthesis Techniques, Inorganic,Synthesis Techniques, Organic,Synthesis Techniques, Peptide,Synthesis, Inorganic,Synthesis, Organic,Synthesis, Synthetic Peptide,Synthetic Chemistry Technique,Synthetic Peptide Syntheses,Technique, Inorganic Synthesis,Technique, Organic Synthesis,Technique, Peptide Synthesis,Technique, Synthetic Chemistry,Techniques, Inorganic Synthesis,Techniques, Organic Synthesis,Techniques, Peptide Synthesis,Techniques, Synthetic Chemistry

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