Protected Triazabutadiene Molecule Acid Stability and Selective Activation

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Solution Overview

Problem

Triazabutadiene molecules are unstable in acidic conditions, leading to irreversible degradation, which limits their applications, and existing methods lack a mechanism for selective activation and controlled release of aryl diazonium species.

Innovation Solution

Development of protected triazabutadiene (pro-triazabutadiene) molecules that are stable in acidic conditions, which can be selectively triggered to release triazabutadiene and subsequently aryl diazonium species using enzymatic, pH-dependent, or light-catalyzed mechanisms.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If triazabutadiene molecules are used directly, then they can release aryl diazonium species, but they are unstable in acidic conditions and degrade irreversibly

Engineering Contradiction:

Improvestability in acidic conditionsVSAvoidselective activation capability

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The triazabutadiene molecule is segmented into two functional parts: a protected triazabutadiene moiety that provides acid stability and an activating group that enables selective degradation. This segmentation allows the molecule to maintain stability during storage and transport while enabling controlled activation when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The triazabutadiene molecule is pre-protected with a stabilizing group before use. This preliminary protection action prevents acid-catalyzed degradation during storage and handling, while the protecting group is designed to be removable under specific conditions to activate the molecule when needed.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If existing protected triazabutadiene methods are used, then stability is improved, but selective activation and controlled release mechanisms are lacking

Engineering Contradiction:

Improveselective activation capabilityVSAvoidactivation mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

An intermediary activating group is introduced that serves as a mediator between the stable protected triazabutadiene form and the active diazonium-releasing form. This intermediary group enables selective conversion under specific conditions (enzymatic, pH-dependent, or light-catalyzed) without requiring complex activation systems.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The activation mechanism relies on changing a single key parameter (such as pH level, enzyme presence, or light exposure) to trigger the conversion from protected to active form. This simple parameter change approach avoids complex activation mechanisms while achieving selective activation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If alkylation of N1 is used to stabilize triazabutadienes, then stability in acidic conditions is achieved, but the alkylation is effectively irreversible

Engineering Contradiction:

Improvestability in acidic conditionsVSAvoidreversibility of protection

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

Instead of using irreversible alkylation, the invention employs protection groups whose bond strength and reactivity can be tuned by changing chemical parameters. The protecting group is designed to be stable under acidic conditions but removable under specific conditions (basic pH, enzymatic action, or light exposure), enabling reversible protection.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The protected triazabutadiene molecule is constructed as a composite structure combining the triazabutadiene core with a removable protecting group. This composite design allows the molecule to exhibit both the stability of the protected form and the functionality of the active form, with the ability to transition between states.

Inventive Principle:

Principle #40Composite materials

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

Enables controlled and selective activation of triazabutadiene molecules, providing a stable platform for drug delivery and biochemical applications by maintaining stability in acidic environments and allowing for triggered release of aryl diazonium species.

Implementation Method 1

an enzyme catalyzes the reaction yielding the aryl diazonium species from the triazabutadiene molecule

Methodology Applied

Scientific EffectEnzymatic catalysis: Enzyme

Implementation Method 2

light-catalyzed cleavage

Methodology Applied

Scientific EffectPhotocatalysis: Photodissociation

Implementation Method 3

pH-dependent cleavage

Methodology Applied

Scientific EffectpH-dependent cleavage: Hydrolysis

Data Source

PatentUS10954195B2Substituted triazenes protected from degradation by carboxylation of N1

Publication Date: 2021.03.23 THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA

AI summary

Triazabutadiene molecules, such as those according to Formula B, which can yield aryl diazonium species, and methods of use of triazabutadiene molecules, for example methods and compositions for yielding an aryl diazonium species from a triazabutadiene molecule, e.g., a protected aryl diazonium species in the form of a triazabutadiene. In some embodiments, an enzyme catalyzes the reaction yielding the aryl diazonium species from the triazabutadiene molecule. As an example, the methods and compositions herein may be used for delivery of drugs.