58-56-0Relevant articles and documents
Biosynthesis of Vitamin B6: Incorporation of D-1-Deoxyxylulose
Hill, Robert E.,Sayer, Brian G.,Spenser, Ian D.
, p. 1916 - 1917 (1989)
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Method for environmentally friendly preparation of vitamin B6 and recycling of tail gas
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Paragraph 0042-0048; 0052-0055, (2019/07/04)
The invention relates to a method for environmentally friendly preparation of vitamin B6 and recycling of tail gas. The method comprises the following steps: carrying out a catalytic formylating reaction on carbon monoxide, hydrogen and 2-cyano-2-cis-butene-1,4-diol which is used as a starting material to prepare a 2-hydroxymethyl-3-cyano-4-hydroxy-n-butyraldehyde intermediate, condensing the intermediate with 2-aminopropionate or 2-aminopropionate hydrochloride, and carrying out salt formation to prepare the vitamin B6. The method does not use a 4-methyl-5-alkoxyoxazole intermediate that is expensive and generates a large amount of wastewater in the production process, and allows the tail gas to be recycled in synthesis of the starting raw material, so the method has the advantages of environmentally friendly process, high reaction selectivity, high product purity, high atom economy, and suitableness for the green industrial production of the vitamin B6.
A process for preparing vitamin B by the malic acid6 The method of
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, (2018/03/26)
The present invention relates to a method of using malic acid to prepare vitamin B6. The method comprises: using malic acid as a starting material; carrying out a hydroxymethylation reaction on the malic acid and formaldehyde in the presence of a basic catalyst to generate 2-hydroxy-2,3-dimethylol butanedioic acid; performing acid catalysis and lactonization for ring-forming to obtain 1H,4H-dihydrofuro[3,4-c]dihydrofuran-1,4-diketone (III); under base catalysis, condensing the obtained compound III and nitro ethane to obtain a compound IV; reducing the compound IV by using sodium borohydride or potassium borohydride to obtain a compound V; performing catalytic hydrogenation on the compound V to obtain a compound VI; and performing hydrolysis and ring-forming on the compound VI in an ethanol-hydrochloric acid system to obtain vitamin B6. According to the method of the present invention, the use of the 4-methyl-5-alkoxyl oxazole intermediate that is expensive and of which the preparation process causes pollution is avoid; the raw materials are inexpensive and readily available; the process is short; and the cost is low. The method in the present invention is simple in operation, less in wastewater discharge, highly environmentally friendly, and suitable for green industrial production of VB6.
Vitamin B6 Intermediate 4 - methyl - 5 - alkyl silicon oxygen radical wicked zuo, its preparation method and process for producing vitamin B6 The method of
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Paragraph 0068; 0069, (2017/08/25)
The invention relates to a vitamin B6 intermediate 4-methyl-5-alkylsiloxane oxazole, a preparation method thereof as well as a method for preparing the vitamin B6. 4-methyl-5-alkylsiloxane oxazole has the structure shown as the formula I. 2-alanine and formaldehyde or paraformaldehyde are subjected to N-hydroxymethylation and lactonization in a solvent under the action of an acid catalyst to obtain 4-methyl-tetrahydro-oxazole-5-ketone (II), the ketone is not separated and is directly subjected to chloro substitution, silicon etherification and an elimination reaction in the presence of an acid-binding agent to generate 4-methyl-5-alkylsiloxane oxazole (I). 4-methyl-5-alkylsiloxane oxazole and 2-n-propyl-1,3-dioxo-5-cycloheptene are subjected to addition and hydrolysis to prepare the vitamin B6. The process is short, the operation is easy, little wastewater is produced, safety and environmental protection are realized, the reaction selectivity is good, a product is low in cost and high in purity, and industrial production is facilitated better.