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461003-95-2

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461003-95-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 461003-95-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,1,0,0 and 3 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 461003-95:
(8*4)+(7*6)+(6*1)+(5*0)+(4*0)+(3*3)+(2*9)+(1*5)=112
112 % 10 = 2
So 461003-95-2 is a valid CAS Registry Number.

461003-95-2Relevant articles and documents

Synthesis of β-azomycin nucleosides: 1-(β-D-2-iodo-2-deoxyarabinofuranosyl)-2-nitroimidazole (β-2-IAZA), a novel marker of tissue hypoxia

Kumar, Piyush,Wiebe, Leonard I.,Beiki, Davood,Ohkura, Kazue,Seki, Koh-Ichi

, p. 4427 - 4429 (2007/10/03)

This study describes a non-conventional approach to the synthesis of 1-β-D-[2-deoxy-2-iodoarabinofuranosyl]-2-nitroimidazole (β-2-IAZA), a positional and configurational isomer of 1-α-D-[5-deoxy-5-iodoarabinofuranosyl]-2-nitroimidazole (IAZA). [123I]IAZA, a radiopharmaceutical used clinically to image regional tissue hypoxia in a number of pathologies, is synthesized by coupling the appropriately protected 1-α-halo arabinofuranoside, with azomycin, with retention of configuration. To circumvent participation of the C-2′ protecting group, which prevents β-anomer formation during coupling, the riboside 1-β-D-(ribofuranosyl)-2-nitroimidazole (AZR) was elaborated to 1-β-D-(3,5-tetraisopropyldisylyloxy-2-O- trifluoromethanesulfonylribofuranosyl)-2-nitroimidazole. Nucleophilic displacement of the 2-O-trifluoromethanesulfonyl leaving group by iodide results in inversion of configuration at the ribosyl C-2-position, thereby affording silylated arabinofuranosyl-2′-IAZA, which was desilylated under neutral conditions to afford β-2-IAZA.

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