An Efficient Synthesis of (±)-Dehaloperophoramidine

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Natural Product Synthesis

Background:

• Perophoramidine and communesin F are indole alkaloids featuring a complex polycyclic core.
• These molecules contain vicinal all-carbon quaternary stereocenters, posing a synthetic challenge.
• Dehaloperophoramidine is a synthetic analog designed for synthetic exploration.

Purpose of the Study:

• To develop a total synthesis of dehaloperophoramidine.
• To discover novel synthetic methodologies through the synthetic endeavor.
• To investigate the reactivity of key intermediates, specifically ortho-amides.

Main Methods:

• Utilized Overman's samarium-mediated reductive dialkylation for stereocenter construction.
• Developed a four-step domino process to form an ortho-amide intermediate.
• Explored ortho-amide reactivity to uncover a second domino reaction for target synthesis.

Main Results:

• Successfully synthesized dehaloperophoramidine in an eight-step sequence.
• Discovered two novel domino reactions, expanding synthetic capabilities.
• Established the trans relative stereochemistry of vicinal all-carbon quaternary stereocenters early in the synthesis.

Conclusions:

• The developed synthetic route provides an efficient pathway to dehaloperophoramidine.
• The discovery of new domino processes highlights innovative synthetic strategies.
• This work contributes to the synthesis of complex polycyclic indole alkaloids.