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133635-43-5

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133635-43-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133635-43-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,6,3 and 5 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 133635-43:
(8*1)+(7*3)+(6*3)+(5*6)+(4*3)+(3*5)+(2*4)+(1*3)=115
115 % 10 = 5
So 133635-43-5 is a valid CAS Registry Number.

133635-43-5Relevant articles and documents

Synthesis of 2',3'-Dideoxynucleosides from 5-Alkoxymethyluracils

Abdel-Megied, Ahmed E.-S.,Pedersen, Erik B.,Nielsen, Carsten M.

, p. 59 - 70 (2007/10/02)

A modified synthesis of protected 2,3-dideoxyribose 5 starting from L-glutamic acid (1) is described.Reaction of 5 with silylated 5-hydroxymethyluracil 7a and 5-alkoxymethyluracils 7b-e in the presence of trimethylsilyl triflate afforded an anomeric mixture of 2',3'-dideoxyuridine derivatives 8a-e and 9a-e.Deprotection with methanolic ammonia and separation by chromatography gave the corresponding nucleosides 10a-e and 11a-e.Treatment of 9b-e with tri(1H-1,2,4-triazol-1-yl)phosphine oxide and subsequent reaction of 12b-e with ammonia in dioxane afforded the cytosine derivatives 13b-e which on treatment with methanolic ammonia gave the corresponding 2',3'-dideoxycytidine derivatives 14b-e and 15b-e.In contrast with the parent compounds, these alkoxymethyl derivatives had no appreciable activity against human immunodeficiency virus (HIV-1).

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