Related Experiment Video
Updated: Jun 12, 2026

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
Published on: November 9, 2019
Cooperative B(C6F5)3/Chiral Secondary Amine-Catalyzed Asymmetric [4 + 2] Cycloaddition Reaction
Dan-Dan Ma1, Li-Xue Xiong1, Wen-Jing Wang1
1Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China.
A novel cycloaddition reaction creates complex spirooxindole compounds with high stereoselectivity. This method utilizes synergistic catalysis for efficient synthesis under mild conditions.
Area of Science:
- Organic Chemistry
- Catalysis
- Asymmetric Synthesis
Background:
- Stereoselective synthesis is crucial for drug discovery and materials science.
- Developing efficient catalytic systems for complex molecule construction remains a challenge.
Purpose of the Study:
- To develop a highly stereoselective [4 + 2] cycloaddition reaction.
- To synthesize spirooxindole-pyran-pyrazole derivatives with multiple stereocenters.
Main Methods:
- Utilized dienamine/Lewis acidic borane synergistic activation.
- Employed chiral secondary amines and B(C6F5)3 catalysts.
Main Results:
- Achieved a highly stereoselective [4 + 2] cycloaddition reaction.
- Synthesized spirooxindole-pyran-pyrazole derivatives with three contiguous stereocenters.
- Obtained products in moderate to good yields with excellent enantioselectivities and diastereoselectivities.
Conclusions:
- Developed a novel synergistic catalytic system combining chiral organocatalysts and Lewis acidic boranes.
- Demonstrated mild reaction conditions and wide functional group tolerance.
- Provided an efficient route to complex stereodefined molecules.
Related Concept Videos
Cycloaddition Reactions: Overview
Cycloaddition Reactions: MO Requirements for Thermal Activation
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation
Nucleophilic Aromatic Substitution: Elimination–Addition
Preparation of Alcohols via Substitution Reactions
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group. The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2, depending on the nature of carbon attached to the halide.
Primary alcohols are synthesized from primary alkyl halides, and the...

![Solid-phase Synthesis of [4.4] Spirocyclic Oximes](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F58508.jpg&w=3840&q=50)