Diarylthiohydantoin Synthesis via Multi-Step Segmentation
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Solution Overview
Problem
Current methods for synthesizing compound (X) for prostate cancer treatment are inefficient and lack optimized processes for converting intermediates into the desired compound.
Innovation Solution
A multi-step process involving reactions with cyclobutanone, sodium cyanide, thiocarbonylating agents, organomagnesium halides, palladium catalysts, and methylamine in specific solvents and temperature ranges to convert compound (VII) into compound (X) through various pathways, including carboxylic acid, ester, and direct conversion routes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current synthesis methods are used for compound (X), then the compound can be produced, but the synthesis efficiency and yield are insufficient
Solution Approach 1:
The synthesis process is divided into distinct sequential steps: formation of compound (V) from compound (I), conversion to compound (VI) using cyclobutanone and sodium cyanide, reaction with compound (IV) to form compound (VII), and final conversion to compound (X). Each step is optimized independently with specific temperature ranges, solvents, and reagents to maximize overall efficiency and yield.
Solution Approach 2:
The patent specifies precise parameter ranges for each reaction step including temperature (0°C to 100°C depending on step), solvent selection (acetic acid, alcoholic solvents with protic acid, organic solvents, aprotic solvents), and stoichiometric ratios of reagents. These controlled parameter changes optimize both reaction speed and product yield at each stage.
2Adaptability or versatility
If multiple conversion pathways are provided for compound (VII) to compound (X), then flexibility is improved, but process complexity increases
Solution Approach 1:
Compound (VII) can be converted to compound (X) through three different pathways: (a) via carboxylic acid intermediate using organomagnesium halide and carbon dioxide, (b) via ester intermediate using organomagnesium halide and alkyl chloroformate/cyanoformate, or (c) direct conversion using molybdenum hexacarbonyl or palladium catalyst with carbon monoxide and methylamine. This multi-functionality allows selection of optimal pathway based on specific production requirements.
Solution Approach 2:
The patent introduces various intermediary compounds and catalysts to facilitate conversion: carboxylic acid (1c) and ester (1e) as intermediates, organomagnesium halide as reagent, molybdenum hexacarbonyl or palladium catalyst with phosphorus ligands as catalysts. These intermediaries enable flexible pathway selection while managing process complexity through standardized intermediate handling.
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 process enhances the efficiency and yield of compound (X) production, providing a reliable method for its synthesis and potential application in prostate cancer treatment.
Implementation Method 1
reacting compound (V) with cyclobutanone in the presence of sodium cyanide; in a solvent such as acetic acid, or a solvent system comprised, consisting, or consisting essentially of an alcoholic solvent and a protic acid; at a temperature of about 0° C. to about 20° C.; to yield the corresponding compound (VI)
Implementation Method 2
reacting compound (IV) and compound (VI) in the presence of a thiocarbonylating agent; in an organic solvent; at a temperature of about 0° C. to about 100° C.; to yield the corresponding compound (VII)
Implementation Method 3
reacting compound (VII) with an organomagnesium halide; in the presence or absence of a lithium halide; followed by the addition of carbon dioxide gas; in an aprotic organic solvent; at a temperature of about 0° C.; to yield the corresponding carboxylic acid compound (1c)
Implementation Method 4
reacting compound (VII) under a carbon monoxide atmosphere; in the presence of a palladium catalyst; in the presence of one or more phosphorus ligands; in the presence of an organic base; in a the presence of water; in an organic solvent; at a temperature of about 0° C. to about 100° C.; to yield the corresponding compound (1c)
Implementation Method 5
reacting compound (1c) with a coupling agent; in an aprotic or protic solvent; at about room temperature; followed by the addition of methylamine; to yield the corresponding compound (X)
Data Source
AI summary
Disclosed are processes and intermediates for the preparation of compound (X), which is currently being investigated for the treatment of prostate cancer.