Dolutegravir Intermediate Synthesis via Merging and Preliminary Action
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Solution Overview
Problem
The existing processes for preparing methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2-carboxylate involve a high number of chemical steps and result in low yields, making them inefficient and costly for industrial production.
Innovation Solution
A novel process involving specific sequential reactions starting from 3-(benzyloxy)-4-oxo-4H-pyran-2-carbaldehyde, including treatments with trimethyl orthoformate, methanolic ammonia, N-bromosuccinimide, n-butyllithium, sulfamic acid, and 2,4-difluorobenzylamine, followed by methylation with methyl iodide, to produce the desired compound in fewer steps with higher yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing processes are used for preparing methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2-carboxylate, then the compound can be produced, but the number of chemical steps is high and yields are low
Solution Approach 1:
The patent combines multiple reaction steps into fewer integrated steps. Specifically, the process merges the formation of the pyridinone ring, the introduction of the dimethoxymethyl group, and subsequent transformations into a more streamlined sequence, reducing the total number of isolated chemical steps while maintaining or improving overall yield
Solution Approach 2:
The patent employs preliminary protection strategies and pre-formed intermediates that enable subsequent reactions to proceed more efficiently. The use of protected intermediates and pre-established functional groups allows for higher yielding transformations in later steps, addressing the low yield problem of existing processes
2Ease of manufacture
If existing processes are used for preparing methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2-carboxylate, then the compound can be produced, but the process is inefficient and costly for industrial production
Solution Approach 1:
The patent optimizes reaction parameters including temperature, solvent selection, catalyst loading, and reaction time to improve yields and efficiency. These parameter changes make the process more suitable for industrial scale-up by improving both yield and operational simplicity, directly addressing the inefficiency and cost issues of existing processes
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
The novel process simplifies the production of methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2-carboxylate, achieving higher yields and reducing the number of reaction steps, making it more efficient and suitable for industrial scale-up.
Implementation Method 1
treating the 3-(benzyloxy)-4-oxo-4H-pyran-2-carbaldehyde with trimethyl orthoformate in the presence of camphorsulfonic acid and a suitable solvent to give 3-(benzyloxy)-2-(dimethoxymethyl)-4H-pyran-4-one
Implementation Method 2
reacting the 3-(benzyloxy)-2-(dimethoxymethyl)-4H-pyran-4-one obtained in step (a) with methanolic ammonia in the presence of an alcoholic solvent to give 3-(benzyloxy)-2-(dimethoxymethyl)pyridin-4(1H)-one
Implementation Method 3
bromonating the 3-(benzyloxy)-2-(dimethoxymethyl)pyridin-4(1H)-one obtained in step (b) with N-bromosuccinimide in the presence of a chlorinated solvent to give 3-(benzyloxy)-5-bromo-2-(dimethoxymethyl)pyridin-4(1H)-one
Implementation Method 4
treating the 3-(benzyloxy)-5-bromo-2-(dimethoxymethyl)pyridin-4(1H)-one obtained in step (c) with n-butyllithium in the presence of dimethylformamide and an ether solvent to give 5-(benzyloxy)-6-(dimethoxymethyl)-4-oxo-1,4-dihydropyridine-3-carbaldehyde
Implementation Method 5
reacting the 5-(benzyloxy)-6-(dimethoxymethyl)-4-oxo-1,4-dihydropyridine-3-carbaldehyde obtained in step (d) with sulfamic acid and sodium chlorite in a suitable solvent to give 5-(benzyloxy)-6-(dimethoxymethyl)-4-oxo-1,4-dihydropyridine-3-carboxylic acid
Implementation Method 6
condensing the 5-(benzyloxy)-6-(dimethoxymethyl)-4-oxo-1,4-dihydropyridine-3-carboxylic acid obtained in step (e) with 2,4-difluorobenzylamine in the presence of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, hydroxybenzotriazole and tertiary amine in a suitable solvent to give 5-(benzyloxy)-N-(2,4-difluorobenzyl)-6-(dimethoxymethyl)-4-oxo-1,4-dihydropyridine-3-carboxamide
Implementation Method 7
methylating the 1-allyl-3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1,4-dihydropyridine-2-carboxylic acid with methyl iodide in the presence of a base and dimethylformamide to give methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyridine-2-carboxylate
Data Source
AI summary
The present invention provides a novel processes for preparation of methyl 3-(benzyloxy)-5-(2,4-difluorobenzylcarbamoyl)-4-oxo-1-(2-oxoethyl)-1,4-dihydropyiridine-2-carboxylate using novel intermediates.