Pure Dopamine（https://www.bloomtechz.com/synthetic-chemical/api-researching-only/pure-dopamine-cas-51-61-6.html）, the chemical name is 3-Hydroxytyramine. Its molecular formula is C8H11NO2, and its relative molecular mass is 153.18g/mol. Is an important neurotransmitter that transmits signals between neurons and regulates activity in the brain and central nervous system. In addition, 3-Hydroxytyramine is also involved in many other physiological processes, such as cardiovascular system control, digestive system response, immune system and retinal function, etc. Dopamine powder is produced in our laboratory, and pure dopamine for sale at the same time.
1. Enzymatic tree synthesis method:
At present, the synthesis of 3-hydroxytyramine by Enzymatic tree synthesis method is relatively common, which has the advantages of environmental protection, high accuracy and high yield. The method is to use tyrosinase to carry out grafting reaction to phenylpropionic acid, and then reduce the raw material tyrosine added in the grafting process to 3-hydroxytyramine through reductase catalysis. The reuse of enzymes greatly improves the yield and maximizes the economic benefits.
Enzymatic dendritic synthesis is an enzyme-catalyzed reaction-based synthesis method that enables highly efficient chemical transformations under mild conditions. This method sequentially converts substrates into products through enzyme-catalyzed reactions, which has the advantages of environmental protection and high efficiency. In the process of preparing 3-Hydroxytyramine, the method can be used to realize high-efficiency synthesis at a lower cost.
The steps of the Enzymatic tree synthesis method are as follows:
(1) Prepare the substrate: L-tyrosine and tyrosinase can be selected as the substrate.
(2) Mix the substrate with tyrosinase. Tyrosinase is a copper ion-dependent enzyme that can catalyze the conversion of L-tyrosine to DOPA, which is the precursor compound of 3-Hydroxytyramine. The reaction formula catalyzed by Tyrpsinase is as follows:
(3) Continue to add L-ascorbic acid. L-ascorbic acid is an electron donor that can help reduce the substrate of tyrosinase, thereby promoting the production of DOPA. The reaction here is as follows:
(4) Add reduced NADH and L-tyrosine. NADH can be used as an electron donor to help the reaction, and L-tyrosine will also be added to it. The reaction here is as follows:
(5) Heat the mixture. The reaction solution was heated to 37°C to promote the reaction. During the reaction process, attention should be paid to temperature control and timing.
(6) Preparation of pure product. After the reaction, the product is identified and purified by means of ultraviolet spectrophotometry and high performance liquid chromatography to obtain high-purity 3-Hydroxytyramine.
As a synthetic method based on enzyme-catalyzed reactions, Enzymatic dendritic synthesis has the following advantages and disadvantages:
advantage:
(1) Using natural enzymes as catalysts does not require the use of organic solvents in the reaction process, which reduces the generation of waste and has good environmental protection.
(2) The reaction conditions are mild, do not require high pressure and high temperature environment, and are friendly to the environment.
(3) Wide selection of substrates and catalysts can be applied to the synthesis of various chemical substances.
shortcoming:
(1) Some enzymes have low catalytic efficiency and need to be improved to obtain higher reaction yields.
(2) The reaction time is usually long, and it takes a long time to obtain the target product.
(3) Some enzymes may be inhibited or inactivated, affecting the reaction.
2. Abderhalden ammonia synthesis method:
The Abderhalden ammonia synthesis method is a novel synthesis method of 3-hydroxytyramine, which is characterized in the synthesis of 3-hydroxytyramine by the reduction reaction of metal amino groups in the absence of solvent and catalyst. This method is still in the research stage, but it has the characteristics of simplicity, high yield, and easy operation, and it is expected to become one of the main synthetic methods in the future.
The Abderhalden ammonia synthesis method is a method for synthesizing 3-Hydroxytyramine through multi-step reactions using Piperonal and formaldehyde as raw materials. The key to this method is the conversion of Piperonal to 3,4-dimethoxyphenylethylamine (DMPEA), followed by ammoniation to obtain 3-Hydroxytyramine. The advantages of this reaction are that the raw materials are readily available, the operation is simple and the yield is high, but there are also some disadvantages at the same time, such as long reaction time and complicated synthetic routes.
The Abderhalden ammonia synthesis method of synthesizing 3-Hydroxytyramine is mainly divided into the following steps:
(1) Using Piperonal as a raw material, a multi-step reaction was performed to synthesize DMPEA
Piperonal first undergoes Schiff base reaction with ethylenediamine to form an intermediate, and then undergoes reduction and decarboxylation reactions to obtain DMPEA.
(2) Convert the obtained DMPEA to 3,4-dimethoxyphenylethanol (DMPE) through an oxidation reaction.
DMPEA undergoes an oxidation reaction in the presence of NaOH to generate DMPE.
(3) Using DMPE as raw material, conduct condensation reaction with formaldehyde in the presence of sodium hydroxide.
The DMPE obtained in the above reaction is condensed with formaldehyde to obtain 3,4-dimethoxyphenyl-2-methyl-2-propenal (DMPA).
(4) 3,4-dimethoxyphenyl-2-methyl-2-propanol (DMP) was obtained through the reduction reaction of DMPA.
The reduction reaction of DMPA requires the use of hydrogen and platinum carbon as a catalyst and is carried out under heating conditions. Down
(5) Using DMP as raw material, 3-Hydroxytyramine was synthesized by ammoniation reaction.
In the presence of NH3, DMP undergoes carboxymethyl reduction and epoxidation reactions to obtain 3-Hydroxytyramine.
The Abderhalden ammonia synthesis method has the following advantages and disadvantages:
advantage:
(1) The raw materials are easy to obtain, the operation is simple and the yield is high.
(2) The intermediate DMPEA can be used in the synthesis of other compounds and has certain application value.
(3) The ammoniation reaction does not need to use too many reactants, which is friendly to the environment.
shortcoming:
(1) The reaction time is relatively long, usually several days or even weeks.
(2) The synthetic route is relatively complex and requires multi-step reactions.
(3) Some steps require the use of toxic reagents and catalysts, and the operation requirements are relatively high.
3. Baeyer-Drewson synthesis method:
The Baeyer-Drewson synthesis is also known as the piperine synthesis of 3-hydroxytyramine. In this method, first, Schiff base reaction is carried out with resorcinol and ammonia water to obtain trihydroindoline, and then a dehydrating agent, maleic anhydride, is used to cause a lactam reaction to generate indoletriketone. Finally, 3-hydroxytyramine is obtained through steps such as diazotization, nitration, and hydrogenation reduction. The method is complicated to operate, but has a high yield and has certain research value.
The Baeyer-Drewson synthesis method is mainly divided into the following steps:
(1) Using β-phenylethylamine as raw material, carry out oxidation reaction to obtain 3,4-dihydroxyphenylethylamine (DHPA).
β-phenylethylamine reacts with hydrogen peroxide under the catalysis of potassium perchlorate or potassium carbonate to generate DHPA. This oxidation reaction needs to be carried out at room temperature, and the reaction time is relatively short.
(2) Using DHPA as a raw material, acetalizes with aldehydes to obtain 3,4-dihydroxy-β-methylphenethylamine.
DHPA can undergo acetalization reaction with formaldehyde or other aldehydes to obtain 3,4-dihydroxy-β-methylphenethylamine.
This acetal reaction needs to be carried out under neutral or alkaline conditions, usually using sodium hydroxide or potassium hydroxide as a catalyst, and proceeding under heating.
(3) Using 3,4-dihydroxy-β-methylphenethylamine as a raw material, undergoes amination reaction with urea or amines to obtain 3-Hydroxytyramine.
3,4-dihydroxy-β-methylphenethylamine can be aminated with urea or other amines to produce 3-Hydroxytyramine.
This amination reaction needs to be carried out under basic conditions, usually using sodium hydroxide or other basic reagents as a catalyst, and carried out under heating conditions.
Baeyer-Drewson synthesis needs to meet the following conditions:
(1) The purity and quality of raw materials need to meet certain requirements to ensure the stability of the reaction and the good properties of the product.
(2) Each step needs to be carried out according to a certain procedure, time and temperature to ensure the efficiency of the reaction and the yield of the product.
(3) Some toxic catalysts and solvents need to be used in the reaction, the operation needs to be very careful, and proper waste disposal is also required.
The reaction mechanism of the Baeyer-Drewson synthesis method is relatively simple, mainly involving steps such as oxidation, acetalization and amination. In this reaction mechanism, β-phenylethylamine first undergoes an oxidation reaction to obtain DHPA. Subsequently, DHPA undergoes acetalization reaction with aldehydes to obtain 3,4-dihydroxy-β-methylphenethylamine. 3,4-dihydroxy-β-methylphenethylamine is aminated with urea or amines to obtain 3-Hydroxytyramine.
The Baeyer-Drewson synthesis has the following advantages and disadvantages:
advantage:
(1) The raw materials are readily available, the operation is simple, the reaction time is short, and the yield is high.
(2) Multiple intermediates can be used in the synthesis of other compounds and have certain application value.
(3) The solvents and catalysts present in the reaction have less impact on the environment.
shortcoming:
(1) The acetal reaction requires the use of certain aldehyde reagents, which is not safe to operate.
(2) Certain steps require the use of toxic catalysts and solvents, requiring high operating requirements.
(3) Some by-products may be produced during the preparation process.
in conclusion:
The Baeyer-Drewson synthesis method is a method of synthesizing 3-Hydroxytyramine from β-phenylethylamine through oxidation, acetalization and amination reactions. This method has certain advantages and disadvantages, and it needs to be selected according to the specific situation in practical application.
To sum up, there are currently many synthetic methods for 3-hydroxytyramine to choose from, such as Enzymatic dendritic synthesis, Abderhalden ammonia synthesis and Baeyer-Drewson synthesis, etc. Different synthetic methods have differences in terms of yield, process conditions, and ease of operation, and the most suitable method should be selected according to the actual situation.