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449141-99-5

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449141-99-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 449141-99-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,9,1,4 and 1 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 449141-99:
(8*4)+(7*4)+(6*9)+(5*1)+(4*4)+(3*1)+(2*9)+(1*9)=165
165 % 10 = 5
So 449141-99-5 is a valid CAS Registry Number.

449141-99-5Relevant articles and documents

Synthesis of new photoactivatable phenylalanine analogues and their incorporation into a model peptide - Phenylseleno derivatives as precursors of α,β-unsaturated ketones in peptide synthesis

Jullian, Valerie,Monjardet-Bas, Veronique,Fosse, Celine,Lavielle, Solange,Chassaing, Gerard

, p. 1677 - 1684 (2007/10/03)

The asymmetric synthesis of (S)-Boc-p-(propanoyl)phenylalanine (10) was performed by alkylation of sultam N-(di- phenylmethylene)glycinate (4). Different pathways for the introduction of a phenylseleno moiety α to the ketone function were investigated. (S)-Boc-p-[2′-(phenylselenenyl)propanoyl]phenylalanine (11) was easily obtained from (S)-Boc-p-(propanoyl)phenylalanine (10). However, the phenylseleno moiety α to the carbonyl group was found to be unstable to the conditions required for solid-phase peptide synthesis. Therefore, (2S)-Boc-p-[2′-(phenylselenenyl)propanoyl]phenylalanine (11) was transformed into Boc-p-[3′-(phenylselenenyl)propanoyl]phenylalanine (13), which was successfully incorporated into the sequence of a model peptide. The corresponding enone function generated under mild acidic conditions was found to be stable in aqueous solution at pH = 7, but suitably reactive upon irradiation. Thus, these phenylalanine analogs bearing an unsaturated ketone represent new photoreactive probes. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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