Diphenylmethane Protecting Agent for Peptide Solubility
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Solution Overview
Problem
Conventional protecting groups for functional groups in peptide synthesis often lead to insolubility in organic solvents, making separation and purification of compounds difficult due to precipitation, which complicates the synthesis process.
Innovation Solution
Development of a diphenylmethane compound with a trialkylsilyloxy substituent that connects to a benzene ring, allowing for protection of functional groups without causing insolubility, enabling easy separation and purification through liquid-liquid phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protecting groups (benzyl esters, tert-butyl ester) are used, then functional groups are protected effectively, but the protected compounds precipitate and become insoluble in organic solvents
Solution Approach 1:
The patent modifies the molecular structure parameters of protecting groups by introducing diphenylmethane-based structures with specific substituents (alkyl, alkoxy, halogen, or aryl groups at positions 3 and 3'). These structural parameter changes maintain the protection function while improving solubility characteristics, allowing protected compounds to remain soluble in organic solvents during peptide synthesis
Solution Approach 2:
The invention creates composite protecting group structures by combining diphenylmethane core with various functional substituents (Y groups such as carboxy, hydroxy, amino, amide, or mercapto groups) and additional alkyl/alkoxy chains. This composite structure achieves both effective protection and improved solubility that conventional single-function protecting groups cannot provide
2Reliability
If conventional protecting groups are used, then functional group protection is achieved, but separation and purification become difficult due to precipitation
Solution Approach 1:
By changing the solubility parameters of protecting groups through diphenylmethane structure modification, the patent enables protected intermediates to remain in solution throughout the synthesis process, allowing straightforward filtration and purification operations without the complications of precipitation that plague conventional methods
3Ease of operation
If diphenylmethane compound with trialkylsilyloxy substituent is used, then solubility in organic solvents is maintained, but structure complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific functional substituents (Y groups) and alkyl/alkoxy chains at particular positions (3 and 3') of the diphenylmethane structure. This localized modification approach maintains overall structural manageability while achieving the desired solubility improvement in specific regions of the molecule
Data Source
AI summary
An object of the present invention is to develop a protecting group, which can prevent solidification or insolubilization of a compound by protecting a functional group to achieve easy separation and purification after a reaction.A diphenylmethane compound represented by general formula (1):wherein Y represents —OR19 (wherein R19 represents a hydrogen atom or an active ester-type protecting group), —NHR20 (wherein R20 represents, for example, a hydrogen atom, a C1-6 linear or branched alkyl group, or an aralkyl group, at least one of R1 to R10 represents a group represented by formula (2):—O—R11—X-A (2)and the others each independently represent a hydrogen atom, a halogen atom, a C1-4 alkyl group, or a C1-4 alkoxy group; R11 represents a C1-16 linear or branched alkylene group; X represents O or CONR21 (wherein R21 represents a hydrogen atom, or a C1-4 alkyl group; and A represents, for example, a group represented by formula (3).