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778570-09-5

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778570-09-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 778570-09-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,7,8,5,7 and 0 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 778570-09:
(8*7)+(7*7)+(6*8)+(5*5)+(4*7)+(3*0)+(2*0)+(1*9)=215
215 % 10 = 5
So 778570-09-5 is a valid CAS Registry Number.

778570-09-5Downstream Products

778570-09-5Relevant articles and documents

An efficient and large-scale enantioselective synthesis of PNP405: A purine nucleoside phosphorylase inhibitor

Prashad, Mahavir,Har, Denis,Chen, Lijian,Kim, Hong-Yong,Repic, Oljan,Blacklock, Thomas J.

, p. 6612 - 6617 (2007/10/03)

An efficient and large-scale enantioselective synthesis of PNP405 (1), a purine nucleoside phosphorylase inhibitor, is described. This synthesis of 1 involved eight steps starting from o-fluorophenylacetic acid with a 21.6% overall yield and >99.5% enantiopurity. The key stereogenic center with (R)-configuration was created using Evans' asymmetric alkylation methodology. This synthesis also features the racemization-free reductive removal of the chiral auxiliary in 5 using sodium borohydride, protection of the γ-cyano alcohol 6 as the trityl ether by a new water-assisted tritylation with trityl chloride and triethylamine or with trityl alcohol and catalytic trifluoroacetic acid, and an efficient one-pot cyclo-guanidinylation of 10 using cyanamide as the guanidinylating agent.

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