Synthesis of a novel diene from a cyclobutane precursor: An entry to 2,9-disubstituted [2]diadamantanes
| Autor: | Ioannou, Savvas, Krassos, H., Nicolaides, Athanassios V. |
|---|---|
| Přispěvatelé: | Nicolaides, Athanassios V. [0000-0003-0841-565X] |
| Rok vydání: | 2013 |
| Předmět: |
chemical reaction
Allylic rearrangement B3LYP Diene Stereochemistry Dimer Biochemistry Medicinal chemistry DFT isomerization Cyclobutane chemistry.chemical_compound Cope rearrangement Drug Discovery iodination cyclobutane derivative Noradamantene adamantane derivative Bond cleavage density functional theory Chemistry Diradical Organic Chemistry article Halogenation X ray crystallography [2]Diadamantane priority journal substitution reaction hydrogen room temperature differential scanning calorimetry Thermolysis |
| Zdroj: | Tetrahedron |
| Popis: | In the gas-phase thermolysis (350 C) of heptacyclic cyclobutane 2, n=1, (the [2+2] dimer of noradamantene) two isomeric dienes (the symmetric 5, n=1 and the asymmetric 6a) and the reduction product [2]diadamantane (7-H) are formed. Computations suggest that at 350 C a diradical intermediate (8, n=1, derived from C-C bond cleavage of 2, n=1) gives rise to 5, n=1. Diradical 8, n=1 is also likely to abstract allylic hydrogens from 5, n=1 affording 7-H, and also to isomerize 5, n=1 to give the diene 6b from which 6a can result as the more stable diene of a Cope rearrangement. The gas-phase thermolysis of 2, n=1, in the presence of iodine affords 7-H at 350 C and the new compound 2,9-diiodo-[2]diadamantane (7-I2) at 150 C. 7-I2 can be easily prepared at room temperature by the iodination of 2, n=1 in CH 2Cl2 and affords in a synthetically useful way diene 5, n=1 by reduction with Na/Hg at room temperature. © 2013 Elsevier Ltd. All rights reserved. 69 37 8064 8068 Cited By :4 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|