Aryne Insertion Reactions into Carbon–Carbon σ-Bonds

Abstract

Diverse nucleophilic carbon–electrophilic carbon σ-bonds were found to undergo facile cleavage and to add across carbon–carbon triple bonds of arynes without the aid of transition-­metal catalysts, leading to the direct introduction of different carbon functionalities into the ortho-positions of aromatic rings. Active methylene compounds including β-dicarbonyl compounds, α-cyanocarbonyl compounds, sulfonylacetonitrile, and malononitrile smoothly underwent the aryne insertion reactions, and, moreover, the reaction was applicable to fluorene and trifluoromethyl ketone derivatives. The total synthesis of cytosporone B and phomopsin C, depending upon the carbon–carbon bond cleavage reaction, is also described.

1 Introduction

2 β-Dicarbonyl Compounds

3 α-Cyanocarbonyl Compounds

4 Sulfonylacetonitrile and Malononitrile

5 Fluorenes

6 Trifluoromethyl Ketones

7 Total Synthesis of Cytosporone B and Phomopsin C

8 Conclusion

Key words

active methylene compounds - arynes - carbon–carbon bond cleavage - fluorenes - natural product synthesis - trifluoromethyl ketones

• References


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