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73945-73-0

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73945-73-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73945-73-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,9,4 and 5 respectively; the second part has 2 digits, 7 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 73945-73:
(7*7)+(6*3)+(5*9)+(4*4)+(3*5)+(2*7)+(1*3)=160
160 % 10 = 0
So 73945-73-0 is a valid CAS Registry Number.

73945-73-0Relevant articles and documents

Preparation method of sofosbuvir key intermediate

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Paragraph 0036; 0037-0038, (2020/07/15)

The invention discloses a preparation method of a sofosbuvir key intermediate ((2R,3R,4R,5R)-3-(benzoyloxy)-5-chloro-4-fluoro-4-methyltetrahydrofuran-2-yl)benzoic acid methyl ester. The preparation method comprises the following steps: by using (R)-2,2-dimethyl-1,3-dioxolane-4-carboxylic acid as a starting material, performing acylating chlorination, performing a reaction with alpha-fluoropropionic acid, performing carbonyl reduction, performing hydroxyl protection, performing hydrolytic cyclization, performing hydroxymethyl protection, performing reduction, and performing chlorination to prepare the sofosbuvir key intermediate ((2R,3R,4R,5R)-3-(benzoyloxy)-5-chloro-4-fluoro-4-methyltetrahydrofuran-2-yl)benzoic acid methyl ester. The preparation scheme has a short synthetic route and a high yield, and avoids a fluorination reaction step in the synthetic process.

A route to homochiral (S)-O-methyl mandelic acid and related α-alkoxy carboxylic acids from isopropylidene glycerol

Handa,Hawes,Pryce

, p. 2837 - 2845 (2007/10/02)

An improved synthesis of the useful ketones 7 is described. These ketones are then further modified via a highly stereospecific reduction to give homochiral α-alkoxy carboxylic acids which are useful chiral auxiliaries and intermediates.

N-Acylation of Amino Acids with Glyceric Acid

Angrick, Michael,Rewicki, Dieter

, p. 377 - 384 (2007/10/02)

Several amino acid esters were N-acylated by isopropylidene-D-glyceric acid chloride.The various blocking groups were selectively removed to yield N-D-glyceroyl-amino acids which are able to intra- or intermolecular condensation. - Keywords: N-(O-Isopropy

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