Bilirubin Synthesis via Precursor Coupling and PEGylation

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Solution Overview

Problem

Current methods for obtaining bilirubin are inefficient, as it is extracted from animals in small quantities and at high costs, and the extracted bilirubin is a mixture of regioisomers requiring additional separation and purification processes.

Innovation Solution

A novel synthesis method for bilirubin involves coupling a compound represented by Formula 1 with a compound represented by Formula 2, followed by reaction with polyethylene glycol (PEG), to produce a compound represented by Formula 3, which can then be processed to obtain bilirubin.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If bilirubin is extracted from animals, then bilirubin can be obtained, but the production quantity is small and production cost is high

Engineering Contradiction:

Improvebilirubin production quantityVSAvoidproduction efficiency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The invention segments the bilirubin molecule into two separate precursors (compounds of Formula 1 and Formula 2) that can be independently synthesized and then coupled together. This allows for scalable production through chemical synthesis rather than being limited by animal extraction capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses compounds of Formula 1 and Formula 2 as intermediary substances that can be chemically synthesized and then coupled to form bilirubin. These intermediaries serve as building blocks that enable industrial-scale production through chemical manufacturing processes.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Quantity of substance

If bilirubin is extracted from animals, then bilirubin can be obtained, but additional separation and purification processes are required

Engineering Contradiction:

Improvebilirubin production quantityVSAvoidseparation and purification process complexity

Core Design Contradiction:

Quantity of substanceVSDevice complexity

Solution Approach 1:

By segmenting bilirubin into two synthesizable precursors and then coupling them, the invention produces bilirubin in a pure, single-regioisomer form directly, eliminating the need for complex separation processes required when extracting mixture-containing bilirubin from animal sources.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention extracts the problematic mixture component from the production process by synthesizing only the desired regioisomer through controlled chemical reactions, thereby eliminating the need for subsequent separation and purification steps.

Inventive Principle:

Principle #2Taking out (Extraction)

3Quantity of substance

If conventional synthesis methods are used, then bilirubin can be produced, but the synthesis conditions are harsh and yield is low

Engineering Contradiction:

Improvebilirubin yieldVSAvoidsynthesis temperature

Core Design Contradiction:

Quantity of substanceVSTemperature

Solution Approach 1:

The invention changes the reaction parameters by using mild base catalysts (such as piperidine, pyrrolidine, or morpholine) and conducting reactions at moderate temperatures (20-100°C), which significantly improves bilirubin yield while avoiding harsh synthesis conditions that damage the sensitive bilirubin molecule.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention replaces harsh mechanical/thermal synthesis methods with milder chemical catalysis using organic bases, thereby achieving high yield under gentler conditions that preserve the integrity of the bilirubin structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 method allows for the economical synthesis of bilirubin under mild conditions, with high yield and suitability for mass production, while also improving the water solubility of the synthesized bilirubin.

Implementation Method 1

preparing a compound represented by Formula 3 below by coupling a compound represented by Formula 1 below with a compound represented by Formula 2 below

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 2

reacting the compound represented by Formula 3 with polyethylene glycol (PEG)

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Implementation Method 3

oxidizing a compound represented by Formula 9 below to prepare the compound represented by Formula 2

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 4

reducing an acetyl group of a compound represented by Formula 10 below to prepare the compound represented by Formula 2

Methodology Applied

Scientific EffectReduction: Reduction

Implementation Method 5

dehydrating a hydroxyl group of a compound represented by Formula 11 below to prepare the compound represented by Formula 2

Methodology Applied

Scientific EffectDehydration:

Data Source

PatentUS20250122154A1Method for synthesizing bilirubin

Publication Date: 2025.04.17 BILIX CO LTD

AI summary

In a method of synthesizing bilirubin according to an embodiment, a compound represented by Formula 3 is prepared by coupling a compound represented by Formula 1 with a compound represented by Formula 2, thereby firstly chemically synthesizing bilirubin and PEGylated bilirubin, which are usefully used in a medical product or the like.