Abstract
Isoxazol-5-one rings have been identified as relevant motifs in drug candidates, agrochemicals, and materials. Furthermore, this heterocycle has been also applied as a versatile building block for the preparation of a variety of densely functionalized molecules. This short review will present the most representative applications of isoxazol-5-ones in organic synthesis while discussing their properties and reactivity.
1 Introduction
1.1 General Aspects
1.1.1 Tautomerism
1.1.2 Importance: Natural Products Isolation, Biological Activity, and Materials
1.1.3 Preparation Methods
2 Isoxazol-5-ones in Organic Synthesis
2.1 General Reactivity
2.2 Specific Examples
2.2.1 Alkylation Strategies
2.2.2 Alkyne Synthesis
2.2.3 Annulation Reactions
2.2.4 N–O Bond Insertions
2.2.4.1 Preparation of 1,3-Oxazin-6-ones
3 Conclusions
Key words
isoxazol-5-ones - heterocycles - decarboxylation - alkynes - 2
H-azirines - pyridines - 1,3-oxazin-6-ones