Abstract
The N–O heterocycles are biologically relevant scaffolds and versatile building blocks
in contemporary organic synthesis. In this short review, we showcase the involvement
and elevation of various cycloaddition strategies towards the production of the N–O
heterocycles; 1,2-oxazines and 1,2-oxazinanes, 1,2-oxazepanes, and 1,2-oxazetidines.
An overview of the advantages and challenges associated with these synthetic endeavors
is provided.
1 Introduction
2 Six-Membered N–O Heterocycles (1,2-Oxazines and 1,2-Oxazinanes)
3 Seven-Membered N–O Heterocycles (1,2-Oxazepanes)
4 Four-Membered N–O Heterocycles (1,2-Oxazetidines)
5 Summary and Outlook
Key words
cycloaddition - nitroso Diels–Alder reaction - nitrones - oxazines - oxazetidines
- oxazepane - cyclopropanes - cascade reaction