Welcome to LookChem.com Sign In|Join Free

CAS

  • or

172941-42-3

Post Buying Request

172941-42-3 Suppliers

Recommended suppliersmore

  • Product
  • FOB Price
  • Min.Order
  • Supply Ability
  • Supplier
  • Contact Supplier

172941-42-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172941-42-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,9,4 and 1 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 172941-42:
(8*1)+(7*7)+(6*2)+(5*9)+(4*4)+(3*1)+(2*4)+(1*2)=143
143 % 10 = 3
So 172941-42-3 is a valid CAS Registry Number.

172941-42-3Relevant articles and documents

Rhodopeptins, novel cyclic tetrapeptides with antifungal activities from Rhodococcus sp.. III. Synthetic study of rhodopeptins

Chiba, Hiroyuki,Agematu, Hitosi,Sakai, Kazuya,Dobashi, Kazuyuki,Yoshioka, Takeo

, p. 710 - 720 (1999)

Total syntheses of cyclo (-Gly-L-Lys-L-Val-(R)-3-aminododecanoyl-); LV9nA and its diastereomer cyclo (-Gly-L-Lys-L-Val-(S)-3-aminododecanoyl-); LV9nB, congeners of rhodopeptin B5 on β-amino acid moiety, were achieved. The β-amino acid moiety was prepared as a racemate by the thermal Michael addition of an amine to α,β-unsaturated ester. The racemic β-amino acids were converted to their L-Valylamide derivatives and the obtained diastereomers were separated. Coupling of both diastereomers, L-Val-β-amino acids with Gly-L-Lys gave linear tetrapeptides, and tetrapeptides were cyclized by diphenylphosphoryl azide (DPPA) method between C-terminus of β-amino acid and N-terminus of Gly to give cyclic tetrapeptides. The deprotected cyclic tetrapeptides, LV9nA and LV9nB, both exhibited almost the same antifungal activity as the naturally obtained rhodopeptins. Furthermore, comparison of the 1H NMR spectra of two congeners and rhodopeptin B5 suggested that the stereochemistry of β-amino acid moiety in natural rhodopeptin B5 has (R)-configuration.

Post a RFQ

Enter 15 to 2000 letters.Word count: 0 letters

Attach files(File Format: Jpeg, Jpg, Gif, Png, PDF, PPT, Zip, Rar,Word or Excel Maximum File Size: 3MB)

1

What can I do for you?
Get Best Price

Get Best Price for 172941-42-3