Angularly fused triquinanes from linear substrates through trimethylenemethane diyl [2 + 3] cycloaddition reaction

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Cycloaddition Reactions

Background:

• Triquinanes are complex polycyclic molecules with significant biological and pharmaceutical interest.
• Efficient synthetic routes to angularly fused triquinane skeletons remain a challenge in organic synthesis.

Purpose of the Study:

• To develop a novel and efficient method for the synthesis of angularly fused triquinanes.
• To explore the utility of trimethylenemethane (TMM) diyl intermediates in cycloaddition reactions for constructing complex carbocyclic frameworks.

Main Methods:

• Synthesis of angularly fused triquinanes via a [2 + 3] cycloaddition reaction.
• Generation of trimethylenemethane (TMM) diyl intermediates from alkynyliodonium salts and nucleophiles.
• Utilizing phenyl(propynyl)iodonium salt and linear dienes as key starting materials.

Main Results:

• Successfully synthesized angularly fused triquinanes through the TMM diyl mediated [2 + 3] cycloaddition.
• Demonstrated the formation of TMM diyl intermediates from alkylidene carbenes derived from alkynyliodonium salts.
• Established a new pathway for accessing complex polycyclic structures.

Conclusions:

• The developed cycloaddition strategy provides an effective route to angularly fused triquinanes.
• This method highlights the versatility of TMM diyl intermediates in organic synthesis.
• Offers a valuable tool for the construction of intricate molecular architectures.