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1276553-23-1

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1276553-23-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1276553-23-1 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,7,6,5,5 and 3 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 1276553-23:
(9*1)+(8*2)+(7*7)+(6*6)+(5*5)+(4*5)+(3*3)+(2*2)+(1*3)=171
171 % 10 = 1
So 1276553-23-1 is a valid CAS Registry Number.

1276553-23-1Relevant articles and documents

Development of scalable syntheses of selective PI3K inhibitors

Huang, Qinhua,Richardson, Paul F.,Sach, Neal W.,Zhu, Jinjiang,Liu, Kevin K.-C.,Smith, Graham L.,Bowles, Daniel M.

, p. 556 - 564 (2011/12/02)

On the basis of a more practical and scalable route to an iodothiophene, an efficient and reliable synthesis has been developed for three selective PI3K inhibitors. From this advanced intermediate, the three title compounds were each prepared in five additional steps. Key learnings also include: high throughput experimentation (HTE) screening toward a more robust Suzuki coupling, a more efficient triazole synthesis, and an acid/base cleanup developed to purify the final compounds. The final enabled synthesis required no column chromatography.

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