2'-O-Modified Adenosine Phosphoramidite Purification at Scale

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Solution Overview

Problem

Existing methods for producing 2'-O-2-(N-substituted carbamoyl)ethylated adenosine phosphoramidite suffer from low reproducibility due to the use of hygroscopic and poorly soluble cesium carbonate as a base, and require complex purification steps involving column chromatography, making them unsuitable for industrial production.

Innovation Solution

The use of a catalytic amount of an alkali metal tertiary alkoxide in the Michael addition reaction, followed by purification through precipitation and solid-liquid separation, and the omission of column chromatography in certain steps, particularly in the adenine protection and silyl protecting group removal steps, with the use of diol silica gel for final purification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If cesium carbonate is used as a base in the Michael addition reaction, then the reaction can proceed, but the reproducibility is low due to hygroscopicity and poor solubility

Engineering Contradiction:

Improvereproducibility of Michael addition reactionVSAvoidhandling difficulty of cesium carbonate

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent changes the base from cesium carbonate to an alkali metal tertiary alkoxide (such as sodium tert-butoxide or potassium tert-butoxide). This parameter change improves solubility in organic solvents and reduces hygroscopicity, thereby enhancing reproducibility while ease of handling.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If column chromatography is used for purification in each step, then high purity product is obtained, but the process complexity and time increase

Engineering Contradiction:

Improvepurity of productVSAvoidcomplexity of purification process

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent introduces diol silica gel as a specialized stationary phase for column chromatography. This parameter change in the purification method enables effective separation with simpler procedures and reduced steps while maintaining high product purity, thereby reducing process complexity.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If column chromatography is performed in every purification step, then product purity is maintained, but production time and cost increase

Engineering Contradiction:

Improvepurity of intermediate compoundsVSAvoidproduction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent applies purification by column chromatography selectively only when necessary (using diol silica gel for specific steps), rather than in every purification step. This partial application maintains required purity levels while significantly reducing production time and increasing overall productivity.

Inventive Principle:

Principle #16Partial or excessive action

4Manufacturing precision

If many purification steps are included, then high purity product is obtained, but the number of operations and materials required increases

Engineering Contradiction:

Improvepurity of final productVSAvoidconsumption of materials and time

Core Design Contradiction:

Manufacturing precisionVSLoss of substance

Solution Approach 1:

The patent uses diol silica gel with specific functional groups that provide enhanced selectivity for the target compounds. This parameter change in the stationary phase allows for more efficient purification with fewer steps, reducing material consumption and time while maintaining high product purity.

Inventive Principle:

Principle #35Parameter changes

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 enables the production of high-purity 2'-O-2-(N-substituted carbamoyl)ethylated adenosine phosphoramidite on a large scale, reducing the effort and resources required for purification and making it suitable for industrial applications.

Implementation Method 1

the Michael addition reaction between an acrylic acid ester and a ribonucleoside

Methodology Applied

Scientific EffectMichael addition reaction: Chemical Bonding

Implementation Method 2

purification by column chromatography in the phosphoramidite formation step is performed using diol silica gel

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentEP4682155A1Production methods for 2'-o-modified adenosine phosphoramidite and intermediate thereof

Publication Date: 2026.01.21 NISSAN CHEM CORP

AI summary

The present invention provides a novel method for producing 2'-O-modified adenosine phosphoramidite represented by formula (7) and intermediates thereof. In the formula, R2 represents an optionally substituted C1-6 alkyl group, an optionally substituted C7-16 aralkyl group, an optionally substituted C2-6 alkenyl group, an optionally substituted C2-6 alkynyl group, or an optionally substituted C6-14 aryl group; P1 represents a protecting group of an amino group; and P2 represents a protecting group of a hydroxy group.