H-Arg(MIS)-OH Synthesis Yield via pH-Controlled Coupling
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Solution Overview
Problem
The existing method for preparing H-Arg(MIS)-OH has a low yield, particularly in Step 3 of the process disclosed in WO 2009/135645 A1, which necessitates an improvement in the synthesis efficiency.
Innovation Solution
A method involving a reaction between a compound of formula (IV) and L-ornithine at a pH of 9 to 12, with specific conditions for temperature, pressure, and reaction time, to produce a compound of formula (V) with higher yield, which can then be further processed to obtain H-Arg(MIS)-OH through subsequent reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the existing method from WO 2009/135645 A1 is used for preparing H-Arg(MIS)-OH, then the synthesis process can be completed, but the yield is low particularly in Step 3
Solution Approach 1:
The patent applies parameter changes by optimizing reaction conditions including pH (9-12), temperature (0-25°C), and reaction time (1-24 hours) to improve the yield of H-Arg(MIS)-OH. The modified procedure achieves significantly higher yields compared to the original WO 2009/135645 A1 method, directly addressing the low yield problem in Step 3.
Solution Approach 2:
The patent employs preliminary action by using pre-synthesized compound of formula (IV) as a starting material, which has already been prepared through optimized previous steps. This allows the focus to be on improving the critical coupling step with L-ornithine, thereby maximizing the overall yield of H-Arg(MIS)-OH.
2Quantity of substance
If the reaction conditions are optimized to improve yield, then more time and resources are required for process development
Solution Approach 1:
The patent applies partial action by focusing optimization efforts on the critical Step 3 (coupling reaction) rather than optimizing all steps equally. By concentrating resources on the yield-limiting step while maintaining acceptable conditions for other steps, the overall process efficiency is improved with minimal additional development time.
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 method achieves a higher yield in the preparation of H-Arg(MIS)-OH, improving the efficiency of the synthesis process compared to the existing methods.
Implementation Method 1
a compound of formula (IV) is reacted with L-ornithine; wherein: a compound of formula (V) is obtained
Data Source
AI summary
The invention discloses a method for the preparation of N-omega-(1,2-dimethylindole-3-sulfonyl)-L-arginine and its derivatives using L-ornithine.