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722499-81-2

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722499-81-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 722499-81-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,2,2,4,9 and 9 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 722499-81:
(8*7)+(7*2)+(6*2)+(5*4)+(4*9)+(3*9)+(2*8)+(1*1)=182
182 % 10 = 2
So 722499-81-2 is a valid CAS Registry Number.

722499-81-2Relevant articles and documents

Biomimetic synthesis of (±)-galanthamine and asymmetric synthesis of (-)-galanthamine using remote asymmetric induction

Node, Manabu,Kodama, Sumiaki,Hamashima, Yoshio,Katoh, Takahiro,Nishide, Kiyoharu,Kajimoto, Tetsuya

, p. 1662 - 1679 (2007/10/03)

(±)-Galanthamine (1) was synthesized in excellent yield by applying PIFA-mediated oxidative phenol coupling of N-(4-hydroxy)phenethyl-N-(3′, 4′,5′-trialkoxy)benzyl formamide (15b) as a key step. Because of the symmetrical characteristics of the pyrogallol moiety in the substrate (15b), the phenol coupling resulted in a sole coupling product except for volatile components from the oxidizing agent. On the basis of the successful results of the above strategy, (-)-galanthamine (1) was synthesized by employing a novel remote asymmetric induction, where conformation of the seven-membered ring in the product of the phenol coupling was restricted by forming a fused-chiral imidazolidinone ring with D-phenylalanine on the benzylic C-N bond of the tri-O-alkylated gallyl amino moiety. The conformational restriction and successive debenzylation of the protected hydroxyl groups on the pyrogallol ring caused diastereoselective cyclization to yield a cyclic ether having the desired stereochemistry for the synthesis of (-)-1.

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