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642073-53-8

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642073-53-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 642073-53-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,0,7 and 3 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 642073-53:
(8*6)+(7*4)+(6*2)+(5*0)+(4*7)+(3*3)+(2*5)+(1*3)=138
138 % 10 = 8
So 642073-53-8 is a valid CAS Registry Number.

642073-53-8Relevant articles and documents

Synthesis of Macrocyclic Peptide Analogues of Proteasome Inhibitor TMC-95A

Berthelot, Alexandra,Piguel, Sandrine,Le Dour, Gwennael,Vidal, Joelle

, p. 9835 - 9838 (2003)

The synthesis of three constrained macrocyclic peptide analogues 1 of TMC-95A as potential proteasome inhibitors is described. The key step involves a Ni(O)-mediated macrocyclization of tripeptides 2 bearing halogenated aromatic side chains for the formation of the biaryl junction. In addition, an enantioselective preparation of L-7-bromotryptophan methyl ester 3 using a Corey-O'Donnell alkylation of the glycine benzophenone imine was achieved in good overall yield with very high ee (>85%) on a multigram scale.

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