Related Experiment Video
Updated: Feb 20, 2026
A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
Published on: August 16, 2018
Nucleo-Palladation-Triggering Alkene Functionalization: A Route to γ-Lactones
Meifang Zheng1, Pengquan Chen1, Liangbin Huang1
1Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P. R. China.
A new palladium-catalyzed method efficiently synthesizes gamma-lactones from homoallylic alcohols in a single step. This approach offers high yields and functional group tolerance for diverse lactone synthesis.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Gamma-lactones are important structural motifs in natural products and pharmaceuticals.
- Existing methods for gamma-lactone synthesis often require multiple steps or harsh conditions.
Purpose of the Study:
- To develop a novel, highly effective, and one-step strategy for synthesizing gamma-lactones.
- To utilize readily available homoallylic alcohols as starting materials.
Main Methods:
- Palladium-catalyzed reaction of homoallylic alcohols.
- One-step synthesis protocol.
- Mild reaction conditions.
Main Results:
- Successful synthesis of aryl, alkyl, and spiro gamma-lactones.
- Good yields achieved for the target lactones.
- Excellent functional group tolerance and high chemoselectivity demonstrated.
Conclusions:
- The developed palladium-catalyzed protocol provides an unprecedented and efficient route to gamma-lactones.
- This method offers a versatile and mild approach for accessing diverse gamma-lactone structures.
More Related Videos
10:17Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
Published on: February 7, 2019
10:42Preparation of N-2-alkoxyvinylsulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
Published on: January 3, 2018
Related Concept Videos
01:10α-Alkylation of Ketones via Enolate Ions
00:51Base-Promoted α-Halogenation of Aldehydes and Ketones
01:21Acid-Catalyzed α-Halogenation of Aldehydes and Ketones
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
02:27Preparation of Alkynes: Alkylation Reaction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
01:38Preparation 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...
01:18Nucleophilic Addition to the Carbonyl Group: General Mechanism
A stronger nucleophile can directly attack the electrophilic center, the carbonyl carbon. The HOMO orbital of the nucleophile interacts with the LUMO (π* antibonding) orbital present on the carbonyl carbon. This interaction breaks the π bond and shifts the π...