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32633-10-6

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32633-10-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 32633-10-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,2,6,3 and 3 respectively; the second part has 2 digits, 1 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 32633-10:
(7*3)+(6*2)+(5*6)+(4*3)+(3*3)+(2*1)+(1*0)=86
86 % 10 = 6
So 32633-10-6 is a valid CAS Registry Number.

32633-10-6Relevant articles and documents

Synthesis method of intermediate of bumetanib

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Paragraph 0106-0113, (2021/12/07)

The invention discloses a synthesis method of an intermediate of bumetanib. The comprises the following steps: protecting amino in 3-amino-4-chlorobenzoic acid as shown in a formula 1 by using a compound containing a benzyl protecting group to obtain a compound as shown in a formula 2; reacting the compound as shown in the formula 2 with thionyl chloride, and treating with ammonia water to obtain a compound as shown in a formula 3; reacting the compound as shown in the formula 3 with phenol to obtain a compound as shown in a formula 4; and reacting the compound as shown in the formula 4 with an oxidizing agent to obtain a bumetanib intermediate as shown in a formula 5, namely 3-amino-4-phenoxy-5-sulfamoyl benzoic acid. Compared with the prior art, the method provided by the invention has the advantages that the use of highly toxic chlorosulfonic acid is avoided, the nitration reaction is avoided, the production organization is facilitated, and the production safety is improved.

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