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90144-66-4

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90144-66-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90144-66-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,1,4 and 4 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 90144-66:
(7*9)+(6*0)+(5*1)+(4*4)+(3*4)+(2*6)+(1*6)=114
114 % 10 = 4
So 90144-66-4 is a valid CAS Registry Number.

90144-66-4Downstream Products

90144-66-4Relevant articles and documents

Nucleic Acid Related Compounds. 88. Efficient Conversions of Ribonucleosides into Their 2',3'-Anhydro, 2'(and 3')-Deoxy, 2',3'-Didehydro-2',3'-dideoxy, and 2',3'-Dideoxynucleoside Analogues

Robins, Morris J.,Wilson, John, S.,Madej, Danuta,Low, Nicholas H.,Hansske, Fritz,Wnuk, Stanislaw F.

, p. 7902 - 7908 (2007/10/03)

Treatment of purine, pyrimidine, and modified purine (antibiotic) ribonucleosides with 2-acetoxy-2-methylpropanoyl (α-acetoxyisobutyryl) bromide in acetonitrile gave mixtures of 2',3'-bromohydrin acetates with different O5' substituents.Significant amounts of 5'-unprotected (hydroxyl) bromo acetates were obtained in some cases, and formation of 2',3'-O-isopropylidene derivatives as minor byproducts was detected for the first time.Acid-catalyzed nucleophilic displacement of chloride by bromide occurred with 2-amino-6-chloropurine riboside, but no substitution of fluoride by bromide was detected with 6-amino- 2-fluoropurine riboside.Treatment of the trans bromo acetate mixtures obtained from purine-type nucleosides with Dowex 1 x 2 (OH(-)) in methanol gave the 2',3'-anhydro (ribo epoxide) compounds.Radical-mediated hydrogenolytic debromination and deprotection gave 2'- and 3'-deoxynucleosides.Treatment of the bromo acetate mixtures with zinc-copper couple or acetic acid-activated zinc effected reductive elimination, and deprotection gave 2',3'-didehydro-2',3'-dideoxy compounds which were hydrogenated to give 2',3'-dideoxynucleosides.A number of these analogues have potent inhibitory activity against AIDS and hepatitis B viruses.New 13C NMR data for several types of unsaturated-sugar nucleosides are tabulated.These procedures are directly applicable for the preparation of L-didehydro-dideoxy and L-dideoxy nucleoside analogues.

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