Amide Cleavage via Amide-Cleaving Directing Group

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Solution Overview

Problem

Current methods for the transition metal-catalyzed transformation of amide-containing compounds using heteronucleophiles are limited by the need for extreme conditions, toxic reagents, and high energy consumption, and lack a general protocol for mild and selective cleavage of amides under neutral conditions.

Innovation Solution

The introduction of an amide-cleaving directing group (ACDG) on the nitrogen atom of amides, which enables metal chelation and hydrogen bonding to activate the carbonyl group, allowing for catalytic cleavage with amines, alcohols, or thiols at lower temperatures and pressures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If extreme conditions and toxic reagents are used for amide cleavage, then the reaction proceeds, but energy consumption increases and harmful factors are introduced

Engineering Contradiction:

Improveamide cleavage reactionVSAvoidtoxic reagents and high energy consumption

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A directing group is introduced as an intermediary element that mediates between the metal catalyst and the amide substrate. The directing group contains a heteroatom that coordinates to the metal catalyst, positioning it precisely at the amide carbonyl group to enable selective cleavage under mild conditions without requiring toxic reagents or extreme energy input

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention changes the reaction parameters by using mild temperatures and neutral pH conditions instead of extreme conditions. The directing group enables the reaction to proceed at lower temperatures by pre-organizing the catalyst-substrate complex, thereby reducing energy consumption while maintaining reaction effectiveness

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If amide cleavage is performed under mild conditions with metal catalysts, then energy consumption is reduced, but the reaction requires specific directing groups and catalysts

Engineering Contradiction:

Improveenergy consumptionVSAvoidreaction system complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The reaction system is segmented into distinct functional components: a directing group module that can be attached to various amide substrates, and a metal catalyst module. This segmentation allows the directing group to be reused across different substrates, reducing overall system complexity while maintaining mild reaction conditions and low energy consumption

Inventive Principle:

Principle #1Segmentation

3Adaptability or versatility

If a general protocol for amide cleavage is developed, then versatility is improved, but selectivity and mild conditions become more difficult to achieve

Engineering Contradiction:

Improvegeneral applicability to various amidesVSAvoidselectivity and mild conditions

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The directing group is designed with universal functionality to coordinate with various metal catalysts and work with different amide substrates. The heteroatom in the directing group serves multiple purposes: coordinating the metal catalyst, positioning it at the carbonyl group, and enabling selective cleavage. This multi-functionality allows a single directing group design to achieve both general versatility across different amides and high selectivity under mild conditions

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach enables chemoselective and mild cleavage of a broad scope of amides, reducing energy consumption and eliminating the need for toxic reagents, with maximum cleavage temperatures below 100°C, facilitating sustainable production of fine and bulk chemicals.

Implementation Method 1

The metal catalyst in formula (Ib) forms a chelate complex with the carbonyl oxygen and the heteroatom of the directing group, activating the carbonyl group for nucleophilic attack by the heteronucleophile

Methodology Applied

Scientific EffectChelation:

Implementation Method 2

The directing group contains a heteroatom available for hydrogen bonding or chelation with a metal, which activates the carbonyl group for nucleophilic attack

Methodology Applied

Scientific EffectHydrogen bonding:

Data Source

PatentEP3362436B1Process for the catalytic directed cleavage of amide-containing compounds

Publication Date: 2021.06.30 UNIVERSITEIT ANTWERPEN

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AI summary

The present invention relates to a catalytic method for the conversion of amide-containing compouds by means of a build-in directing group and upon the action of a heteronucleophilic compound (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or a thiol (RSH)) in the presence of a metal catalyst to respectively esters, thioesters, carbonates, thiocarbonates and to what is defined as amide-containing compounds (such as carboxamides, urea, carbamates, thiocarbamates). The present invention also relates to these amide-containing compounds having a build-in directing group (DG), as well as the use of such directing groups in the catalytic directed cleavage of N-DG amides with the use of heteronucleophiles (in se an amine (RNH2 or RNHR') or an alcohol (ROH) or thiol (RSH)).