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69359-21-3

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69359-21-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 69359-21-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,3,5 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 69359-21:
(7*6)+(6*9)+(5*3)+(4*5)+(3*9)+(2*2)+(1*1)=163
163 % 10 = 3
So 69359-21-3 is a valid CAS Registry Number.

69359-21-3Relevant articles and documents

Reaction of 6-Methylsulfonylpurine Riboside with Carbon Nucleophiles and the Synthesis of 6-Alkylpurine Nucleosides. (Nucleosides and Nucleotides. XXIX)

Yamane, Akira,Matsuda, Akira,Ueda, Tohru

, p. 150 - 156 (2007/10/02)

Treatment of 6-methylsulfonyl-9-(2,3,5-tri-O-benzoyl-β-D-ribofuranosyl)purine with ethyl acetoacetate and sodium hydride in tetrahydrofuran afforded, after deblocking, 6-ethoxycarbonylmethyl-9-β-D-ribofuranosylpurine.Similarly, replacement of the 6-methylsulfonyl moiety with other carbanions derived from diethyl malonate, ethyl cyanoacetate, malononitrile, nitromethane, and sodium cyanide gave the corresponding 6-C-substituted purine nucleosides.Most of these derivatives exist as the 6-(1H)-exomethylene tautomeric forms. 6-Ethoxycarbonylmethylpurine riboside was further converted to 6-methyl, ethyl, propyl, butyl, and pentyl-purine ribosides by decarboxylation or prior alkylation of the methylene group followed by de-carboxylation.This reaction sequence facilitated the preparation of hitherto almost inaccessible alkyl or C-substituted purine nucleosides.Keywords- nucleophilic aromatic substitution; carbon nucleophiles; purine nucleosides; UV; NMR; tautomerism

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