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Synthesis of Isoxazole and 1,2,3-Triazole Isoindole Derivatives via Silver- and Copper-Catalyzed 1,3-Dipolar Cycloaddition Reactions.
- Source :
- Molecules; Mar2016, Vol. 21 Issue 3, p307-318, 12p, 5 Diagrams, 1 Chart, 2 Graphs
- Publication Year :
- 2016
-
Abstract
- The CuI- or Ag<subscript>2</subscript>CO<subscript>3</subscript>-catalyzed [3+2] cycloaddition of propargyl-substituted dihydroisoindolin- 1-one (3) with arylnitrile oxides 1a–d (Ar = Ph, p-MeC<subscript>6</subscript>H<subscript>4</subscript>, p-MeOC<subscript>6</subscript>H<subscript>4</subscript>, p-ClC<subscript>6</subscript>H<subscript>4</subscript>) produces in good yields novel 3,5-disubstituted isoxazoles 4 of the ethyl-2-benzyl-3-oxo-1-((3-arylisoxazol-5yl)methyl)- 2,3-dihydro-1H-isoindole-1-carboxylate type. With aryl azides 2a–d (Ar = Ph, p-MeC<subscript>6</subscript>H<subscript>4</subscript>, p-OMeC<subscript>6</subscript>H<subscript>4</subscript>, p-ClC<subscript>6</subscript>H<subscript>4</subscript>), a series of 1,4-disubstituted 1,2,3-triazoles 6 (ethyl-2-benzyl-3-oxo-1-((1-aryl-1H-1,2,3- triazol-4-yl)methyl)-2,3-dihydro-1H-isoindole-1-carboxylates) was obtained. The reactions proceed in a regioselective manner affording exclusively racemic adducts 4 and 6. Compared to the uncatalyzed cycloaddition, the yields are significantly improved in the presence of CuI as catalyst, without alteration of the selectivity. The regio- and stereochemistry of the cycloadducts has been corroborated by an X-ray diffraction study of 4a, and in the case of 6a by XH-correlation and HMBC spectra. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14203049
- Volume :
- 21
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Molecules
- Publication Type :
- Academic Journal
- Accession number :
- 113756345
- Full Text :
- https://doi.org/10.3390/molecules21030307