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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Enantio- and regioselective iridium-catalyzed allylic esterification.
Jianping Qu1, Lydia Roßberg, Günter Helmchen
1Organisch-Chemisches Institut der Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany.
This study presents a new iridium-catalyzed reaction for synthesizing branched allylic esters with high selectivity. The method directly converts carboxylates and allylic phosphates, sometimes including kinetic resolution for enhanced enantiomeric excess.
Area of Science:
- Organometallic Chemistry
- Organic Synthesis
- Catalysis
Background:
- Allylic esterification is a crucial transformation in organic synthesis.
- Developing enantioselective and regioselective methods remains a key challenge.
- Iridium catalysis offers unique reactivity for C-C bond formation.
Purpose of the Study:
- To develop a novel Ir-catalyzed method for direct allylic esterification.
- To achieve high enantioselectivity and regioselectivity in the synthesis of branched allylic esters.
- To explore the potential for kinetic resolution during the esterification process.
Main Methods:
- Utilizing iridium complexes as catalysts.
- Employing carboxylates as nucleophiles.
- Using linear allylic phosphates as electrophiles.
- Investigating reaction conditions for optimal yield and selectivity.
Main Results:
- Successful synthesis of branched allylic esters with high enantioselectivity and regioselectivity.
- Demonstration of carboxylates as effective nucleophiles in Ir-catalyzed allylic substitution.
- Observation of kinetic resolution in specific cases, leading to altered enantiomeric excess.
Conclusions:
- The developed Ir-catalyzed allylic esterification provides a direct route to valuable branched allylic esters.
- The reaction exhibits excellent control over stereochemistry and regiochemistry.
- The concurrent kinetic resolution offers an additional layer of stereochemical control.
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