868-10-0Relevant academic research and scientific papers
Preparation methods for 5-aminolevulinic acid hydrochloride and 5-aminolevulinic acid hydrochloride intermediate
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Paragraph 0075; 0076; 0079; 0096, (2018/09/11)
The invention discloses preparation methods for a 5-aminolevulinic acid hydrochloride and a 5-aminolevulinic acid hydrochloride intermediate. The preparation method for the 5-aminolevulinic acid hydrochloride intermediate comprises: (1) carrying out a reaction on a compound 2 and isopropylidene malonate in an organic solvent under the actions of an organic alkali and a condensing agent to obtain acompound 3; and (2) carrying out a reaction on the compound 3 in a C1-C4 alcohol solvent to obtain a compound 4, wherein R1 and R' are respectively and independently C1-C4 alkyl. The present invention further provides a method for preparing a 5-aminolevulinic acid hydrochloride by using the 5-aminolevulinic acid hydrochloride intermediate. According to the present invention, the intermediate product is basically solid and is easily crystallized and purified; and the method has characteristics of high yield, low production cost and easy operation, and is suitable for industrial production. Thecompounds 1, 2, 3 and 4 are defined in the specification.
BENZOXAZEPINE COMPOUND
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Page/Page column 27, (2010/11/08)
A compound represented by the formula [1]: wherein ring A and ring B each represent an optionally substituted benzene ring; ring C represents an optionally further substituted aromatic ring; R1 represents a lower alkyl group optionally substituted with an optionally substituted hydroxyl group; X1a represents a bond or optionally substituted lower alkylene; X1b represents a bond or optionally substituted lower alkylene; X2 represents a bond, -O- or -S-; X3 represents a bond or an optionally substituted divalent hydrocarbon group; Y represents an optionally esterified or amidated carboxyl group, or a salt thereof. The compound of the formula [I] is safer and has more potent lipid lowering activity such as squalene synthase inhibitory activity (cholesterol lowering activity) and triglyceride lowering activity, and thus it is a compound useful as an agent for preventing or treating hyperlipemia.
Biosynthesis of Porphyrins and Related Macrocycles. Part 16. Proof that the Single Intramolecular Rearrangement leading to Natural Porphyrins (Type-III) occurs at the Tetrapyrrole Level
Battersby, Alan R.,Fookes, Christopher J. R.,Meegan, Mary J.,McDonald, Edward,Wurziger, Hanns K. W.
, p. 2786 - 2799 (2007/10/02)
The unrearranged aminomethylbilane (2) is synthesised by a rational route and is proved to be converted by the enzymes deaminase and cosynthetase, working co-operatively, into uro'gen-III (3).The single rearrangement step established earlier is thus proved to take place at the tetrapyrrole level.Synthesis of singly 13C-labelled bilane (2) followed by its enzymic conversion into uro'gen-III serves to register each of the pyrrole rings of the product relative to the initial bilane.Finally, methods for synthesis of the bilane are developed in two different doubly 13C-labelled forms to allow the following key points to be established largely by 13C n.m.r. spectroscopy: (a) as the bilane system is converted into uro'gen-III, intramolecular rearrangement of the terminal ring D occurs, and (b) the linear tetrapyrrole is converted intact into uro'gen-III.Syntheses of -, and -uroporphyrin octamethyl ester are described together with improved h.p.l.c. conditions for the separation of isomeric coproporphyrin tetramethyl esters.
