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147698-07-5

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147698-07-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 147698-07-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,7,6,9 and 8 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 147698-07:
(8*1)+(7*4)+(6*7)+(5*6)+(4*9)+(3*8)+(2*0)+(1*7)=175
175 % 10 = 5
So 147698-07-5 is a valid CAS Registry Number.

147698-07-5Relevant articles and documents

Chirospecific Synthesis of (1S,3R)-1-Amino-3-(hydroxymethyl)cyclopentane, Precursor for Carbocyclic Nucleoside Synthesis. Dieckmann Cyclization with an α-Amino Acid

Bergmeier, Stephen C.,Cobas, Agustin A.,Rapoport, Henry

, p. 2369 - 2376 (2007/10/02)

Carbocyclic nucleosides are important isosters of nucleosides possessing a variety of antiviral and antineoplastic activities.We report here a new method for the chirospecific synthesis of (1S,3R)-1-amino-3-(hydroxymethyl)cyclopentane.This compound is a key precursor for the synthesis of some carbocyclic nucleosides.The method involves (1) an improved synthesis of (S)-2-aminoadipic acid; (2) Dieckmann cyclization of this α-amino acid to an aminocyclopentanone; and (3) elaboration of the latter to the target (1S,3R)-1-amino-3-(hydroxymethyl)cyclopentane.The starting (S)-2-aminoadipic acid δ-methyl ester was prepared enantiomerically pure from (S)-aspartic acid in 51percent overall yield.Dieckmann condensation converted this amino acid to a (methoxycarbonyl)-cyclopentanone, and reduction of the ketone followed by elimination yielded (S)-3--1-(methoxycarbonyl)cyclopentene.Reduction of the double bond gave a mixture of the cis and trans diastereomers.This mixture was converted to a single diastereomer by epimerization and trapping of the cis isomer as (1S,4R)-2-(9-phenylfluoren-9-yl)-2-azabicycloheptan-3-one.Hydrolytic cleavage of the lactam followed by reduction gave (1S,3R)-1-amino-3-(hydroxymethyl)cyclopentane.

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