![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)
Electrocatalytic Enantioselective Reductive Cross-Coupling for Accessing Chiral α-Aryl Phosphonates
Yin-Hui Huang1, Bi-Yu Yang1, Lin Dong1
1Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu610041, China.
Organic Letters
|July 21, 2026
Summary
This study introduces a sustainable method for creating chiral molecules using electrochemistry and nickel catalysis. The novel approach enables efficient asymmetric C-C bond formation, yielding valuable enantioenriched compounds.
Area of Science:
- Organic Chemistry
- Catalysis
- Sustainable Chemistry
Background:
- Chiral molecules are crucial in pharmaceuticals and materials science.
- Developing sustainable and efficient catalytic methods for synthesizing chiral compounds is a key challenge.
- Asymmetric catalysis offers a powerful route to enantiomerically pure compounds.
Purpose of the Study:
- To develop a novel electrochemical method for asymmetric C-C bond formation.
- To explore the synergistic potential of electrochemistry and nickel catalysis for enantioselective synthesis.
- To synthesize enantioenriched α-aryl phosphonates from readily available precursors.
Main Methods:
- Electrochemical asymmetric catalysis.
- Nickel-catalyzed reductive cross-coupling reaction.
- Utilizing α-bromophosphonates and aryl iodides as substrates.
- Cyclic voltammetry and control experiments for mechanistic investigation.
Main Results:
- Achieved enantioselective synthesis of α-aryl phosphonates with excellent enantioselectivity.
- Demonstrated broad substrate scope and high functional-group tolerance.
- Successfully applied the method for late-stage functionalization of bioactive molecules.
- Identified NiI species as the key intermediate activating the α-bromophosphonate via single-electron transfer.
Conclusions:
- The developed method provides a practical and versatile platform for asymmetric C-C bond formation.
- This electrochemically driven nickel-catalyzed approach offers a sustainable and efficient route to chiral phosphonates.
- The study highlights the power of combining electrochemistry with transition metal catalysis for complex molecule synthesis.
Related Concept Videos
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
01:15α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction
The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
01:10α-Alkylation of Ketones via Enolate Ions
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the strong interaction...
01:19α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview
The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
01:17Thermal Electrocyclic Reactions: Stereochemistry
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
01:19Aldehydes and Ketones to Alkenes: Wittig Reaction Overview
The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.