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Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

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Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

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Updated: Oct 10, 2025

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry

Published on: July 20, 2016

Pd(II)-Mediated C-H Activation for Cysteine Bioconjugation.

James A R Tilden¹, Anneke T Lubben², Shaun B Reeksting²

¹Department of Chemistry, University of Bath, Claverton Down, BA2 7AY, Bath, United Kingdom.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|December 14, 2021

Summary

Researchers developed new palladium(II) complexes for efficient cysteine bioconjugation. This cost-effective method offers high selectivity for peptides and proteins, simplifying synthetic chemistry.

Keywords:

C−H activation bioconjugation cross-coupling cysteine palladium

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Constructing Cyclic Peptides Using an On-Tether Sulfonium Center

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Published on: September 28, 2022

Area of Science:

Synthetic Chemistry
Bioconjugation Chemistry
Organometallic Chemistry

Background:

Selective bioconjugation of biomolecules is challenging due to harsh reaction conditions and high functionality.
Current transition-metal mediated bioconjugation often relies on palladium(II) complexes synthesized via oxidative addition.
There is a need for more efficient, cost-effective, and user-friendly bioconjugation methods.

Purpose of the Study:

To develop novel palladium(II) complexes for cysteine bioconjugation using a facile C-H activation process.
To evaluate the efficiency and selectivity of these new complexes compared to existing methods.
To demonstrate the utility of these complexes in bioconjugating model peptides and proteins.

Main Methods:

Synthesis of palladium(II) complexes via a C-H activation pathway.
Testing bioconjugation efficiency with model peptides.
Assessing selective arylation of surface cysteine residues on a model protein.

Main Results:

The novel Pd(II) complexes achieve bioconjugation efficiency competitive with current literature standards.
The synthesis is user-friendly, utilizes common Pd(II) sources, and employs a cost-effective ligand.
The complexes can be used without isolation and still provide high conversion efficiency and selectivity for model peptides.
Selective arylation of a single surface cysteine residue on a model protein was demonstrated.

Conclusions:

Facile C-H activation provides a cost-effective and efficient route to palladium(II) complexes for cysteine bioconjugation.
These complexes offer a user-friendly alternative to existing methods, suitable for both peptide and protein modification.
The ability to use unisolated complexes enhances practicality and broadens their applicability in synthetic chemistry.