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943542-51-6

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943542-51-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 943542-51-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,4,3,5,4 and 2 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 943542-51:
(8*9)+(7*4)+(6*3)+(5*5)+(4*4)+(3*2)+(2*5)+(1*1)=176
176 % 10 = 6
So 943542-51-6 is a valid CAS Registry Number.

943542-51-6Relevant articles and documents

Enantioselective total synthesis of (-)-salinosporamide A (NPI-0052)

Ling, Taotao,Macherla, Venkat R.,Manam, Rama Rao,McArthur, Katherine A.,Potts, Barbara C. M.

, p. 2289 - 2292 (2008/02/05)

A novel enantioselective total synthesis of 20S proteasome inhibitor Salinosporamide A (NPI-0052; 1) is presented. Key features include intramolecular aldol cyclization of 6 to simultaneously generate the three chiral centers of advanced intermediate 5, cyclohexene ring addition using B-2-cyclohexen-1-yl-9-BBN, and inversion of the C-5 stereocenter by oxidation followed by enantioselective enzymatic reduction.

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