One-Pot Oligocarbamate Synthesis with Sequence Control
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Solution Overview
Problem
Current methods for synthesizing oligocarbamates are limited by their inability to control the monomeric sequence, resulting in heterogeneous structures and molar mass distributions. Additionally, these methods require purification between steps, making them inefficient and costly, especially for industrial-scale production.
Innovation Solution
A one-pot synthesis method is developed, where oligocarbamates with a defined monomeric sequence are synthesized by performing multi-stage reactions in a single reaction pot without the need for intermediate purification. This method involves the activation of alcohols with N,N'-disuccinimidyl carbonate and subsequent chemoselective coupling with aminoalcohols, with fresh portions of the activator or monomer added after complete conversion of previous steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If stepwise polymerisation methods are used for oligocarbamate synthesis, then the process is simple and scalable, but the monomeric sequence cannot be controlled and the product has heterogeneous structure and molar mass distribution
Solution Approach 1:
The synthesis process is segmented into discrete steps where specific monomers are added sequentially to control the sequence. Each step involves adding a specific monomer (e.g., aminoalcohol, carbamate) to build the polymer chain in a controlled manner, allowing precise control over the monomeric sequence while maintaining scalability.
Solution Approach 2:
The initiator is pre-functionalized with specific groups (e.g., hydroxyl, carboxyl) before synthesis begins. This preliminary preparation allows the first monomer to be selectively incorporated, establishing the sequence from the start. The pre-formed initiator ensures controlled initiation and prevents random polymerization.
2Manufacturing precision
If iterative synthesis on a support is used to achieve controlled monomeric sequence, then homogeneous oligocarbamates with defined sequence are obtained, but the synthesis is limited to small scale and requires excessive reagents and solvents
Solution Approach 1:
The solid support is extracted/removed from the synthesis process entirely. Instead of using a solid support to control sequence, the patent uses solution-phase synthesis with controlled addition of monomers and activators. This eliminates the need for support materials, excessive solvents, and complex purification steps while maintaining sequence control.
Solution Approach 2:
The synthesis parameters (concentration, temperature, addition rate) are optimized to enable controlled polymerization in solution without requiring solid support. By adjusting these parameters, the patent achieves homogeneous oligocarbamates with defined sequences while using stoichiometric amounts of reagents rather than excessive quantities.
3Reliability
If purification steps are included between synthesis steps, then product purity is maintained, but synthesis time and cost increase significantly
Solution Approach 1:
The synthesis process continues without interruption between steps. Monomers and activators are added sequentially, and the polymerization proceeds continuously without requiring purification steps in between. This continuous action maintains high productivity while the controlled nature of the reaction ensures product purity through selective incorporation of monomers.
Solution Approach 2:
The synthesis process uses feedback mechanisms (monitoring conversion, adjusting addition rates) to ensure high purity without requiring purification steps. By monitoring the reaction progress and controlling the addition of monomers based on conversion data, the patent maintains product purity while eliminating time-consuming purification operations.
4Adaptability or versatility
If solid support synthesis is used, then sequence control is achieved, but the method cannot be scaled to industrial production
Solution Approach 1:
The mechanical solid support system is replaced with a chemical solution-based system. Instead of using physical adsorption on a solid support to control sequence, the patent uses chemical control through selective activation and monomer addition in solution. This substitution enables industrial scaling while maintaining sequence control capability.
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 allows for the production of homogeneous oligocarbamates with controlled monomeric sequences, eliminating the need for purification and reducing costs. It is scalable, uses less organic solvent, and does not require excessive reagents or a solid support, making it suitable for industrial applications.
Implementation Method 1
activation of the alcohol group with N,N'-disuccinimidyl carbonate
Implementation Method 2
chemoselective aminoalcohol coupling reaction resulting in a carbamate bond
Data Source
Figure 1~2
AI summary
The subject matter of the invention is a method for the preparation of oligocarbamates with a defined monomeric sequence of the general formula (I) characterised in that the multistage synthesis is performed in one reaction pot without the necessity for purification between successive reactions, and the synthesis is driven by the addition of fresh portions of the Ν,Ν'-disuccinimidyl carbonate activator or a monomer in the form of HO-R2-NH2 aminoalcohol, after complete conversion of the previous step has been confirmed, the method comprising the following steps: i. initiation which comprises the activation of 1 equiv. of alcohol dissolved in dry acetonitrile - a solution of 0.1-1 M with 3-12 equiv. of dry pyridine added -by the addition of an activator, being 1.2-2.1 equiv. of Ν,Ν'-disuccinimidyl carbonate, to the mixture and performing the reaction at room temperature until complete activation of alcohol, wherein the R1-OH alcohol is an aromatic primary or secondary alcohol not containing free nucleophilic groups in its structure; (ii.) at least one propagation of the oligomer chain by the addition of a portion of 1-2 equiv. of the first monomer in the form of HO-R 2-NH2 alcohol to 1 equiv. of the activated alcohol of step (i.) and performing the reaction until complete conversion of the activated alcohol, and then the addition of a further portion of the activator, being 1.2-2.1 equiv. of Ν,Ν'-disuccinimidyl carbonate, to activate the hydroxyl group of the growing macromolecule, wherein the substituent R2 is selected from the group comprising a linear or branched C3-C8 alkyl and a C3-C8 alkyl having at least one aryl, composed of 3-8 carbon atoms and not containing free nucleophilic groups in its structure; (iii.) repeating the propagation step until the desired oligocarbamate sequence is achieved.