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227288-23-5

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227288-23-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 227288-23-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,7,2,8 and 8 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 227288-23:
(8*2)+(7*2)+(6*7)+(5*2)+(4*8)+(3*8)+(2*2)+(1*3)=145
145 % 10 = 5
So 227288-23-5 is a valid CAS Registry Number.

227288-23-5Relevant articles and documents

Synthesis and structure of a small macrocyclic hexapeptide model for antiparallel β-sheet containing two restrained 2-(3'-aminopropynyl)-aniline reverse-turn mimetics

Pitt, Nigel,Gani, David

, p. 3811 - 3814 (2007/10/03)

A new reverse-turn mimetic containing a 2-(3'-aminopropynyl)-phenyl moiety in place of the natural i + 1 and i + 2 turn residues is described in which the key C-C bond was formed from an N-protected propargylamine and 2- iodoaniline using Heck chemistry. Nucleophilic displacement of triflate from activated (2S)-2-hydroxyalkanoate esters by the anilino N-atom, with inversion at C-2, gave homochiral tripeptide mimetics. Two variants of these were coupled and the product was deprotected and then cyclised to give a stable cyclo-hexapeptide analogue that possessed an anti-parallel β-sheet structure as determined by NMR spectroscopy.

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