Abstract
Enantioselective synthesis of cyclobutane derivatives is still a challenging topic in asymmetric synthesis. [2+2] Cycloaddition and skeleton rearrangement are two primary strategies to this end. Recently, functionalization of cyclobutanones and cyclobutenones, which are readily available via [2+2] cycloadditions as prochiral substrates, has emerged as a powerful tool to access versatile four-membered ring compounds. Herein, we summarize some recent advances in these areas from our and other groups.
1 Introduction
2 Enantioselective Functionalization of Cyclobutanones
2.1 Chiral Lithium Amide Approach
2.2 Enamine Approach
3 Enantioselective Functionalization of Cyclobutenones
4 Conclusion
Key words
cyclobutanone - cyclobutenone - desymmetrization - conjugate addition - chiral lithium amide - enantioselective reduction