Abstract
This methodology-oriented review covers the synthetic strategies to construct seven-membered
carbocycles in naturally occurring compounds over the last ten years. It offers an
insight into the common synthetic targets and approaches and provides useful information
for further developments within this area of natural product synthesis as well as
synthetic methodology in general.
1 Introduction
2 Cyclization Reactions
3 Cycloaddition Reactions
3.1 [5+2] Cycloaddition
3.2 [4+3] Cycloaddition
3.3 Diels–Alder Reactions
3.4 [2+2+2] Cycloaddition
4 Ring-Closing Metathesis
4.1 Ene–Ene Metathesis
4.2 Ene–Yne Metathesis
5 Ring-Expansion and Ring-Contraction Reactions
5.1 Ring-Expansion Reactions
5.2 Ring-Contraction Reactions
6 Fragmentation and Isomerization Reactions
7 Other Frequently Targeted Natural Products
8 Conclusion
Key words
seven-membered carbocycles - natural products - total synthesis - synthetic strategy
- medium-sized carbocycles