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632340-57-9

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632340-57-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 632340-57-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,2,3,4 and 0 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 632340-57:
(8*6)+(7*3)+(6*2)+(5*3)+(4*4)+(3*0)+(2*5)+(1*7)=129
129 % 10 = 9
So 632340-57-9 is a valid CAS Registry Number.

632340-57-9Relevant articles and documents

One-Pot Synthesis of 3-(1,2,3,4-Tetrahydroisoquinolin-1-yl)-isoquinolin-1(2 H)-ones by DEAD-Promoted Oxidative Ugi-Wittig -Reaction Starting from Phosphonium Salt Precursors

Zhao, Long,Yang, Mao-Lin,Sun, Mei,Ding, Ming-Wu

supporting information, p. 66 - 69 (2021/11/16)

A new one-pot synthesis of 3-(1,2,3,4-tetrahydroisoquinolin-1-yl)-isoquinolin-1(2H)-ones by DEAD-promoted oxidative Ugi Wittig reaction was developed. The sequential reactions of (2-carboxybenzyl)triphenylphosphonium salts, isocyanides, and N-aryl-1,2,3,4

Method for synthesizing roxadustat intermediate

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Paragraph 0023-0058, (2019/12/08)

The invention belongs to the technical field of chemical preparation, and discloses a method for synthesizing a roxadustat intermediate. The method comprises the following steps: mixing 4-bromo-2-methylbenzoic acid and a solvent to obtain a mixture 1, adding N-bromosuccinimide and an initiator into the mixture 1, performing uniform mixing to obtain a mixture 2, and performing a reaction to obtainthe roxadustat intermediate 5-bromophthalide. The method provided by the invention has the following advantages: the method for synthesizing the roxadustat intermediate provided by the invention adopts the 4-bromo-2-methylbenzoic acid as the reaction raw material, the raw material is simple and easy to obtain, the costs are low, the reaction is easy to control, and the final product 5-bromophthalide has a yield of 96.5% or more and purity of 98.5% or more.

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