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57956-49-7

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57956-49-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57956-49-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,9,5 and 6 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 57956-49:
(7*5)+(6*7)+(5*9)+(4*5)+(3*6)+(2*4)+(1*9)=177
177 % 10 = 7
So 57956-49-7 is a valid CAS Registry Number.

57956-49-7Relevant articles and documents

Reaction of silyl ketene acetals with epoxides: A new method for the synthesis of γ-butanolides

Maslak, Veselin,Matovi?, Radomir,Sai?i?, Radomir N.

, p. 8957 - 8966 (2004)

Titanium tetrachloride promoted reaction of silyl ketene acetals with epoxides, followed by acidic work-up, affords butanolides in moderate/good yields. With epihalohydrins the reaction is regioselective and occurs at the less substituted end of the epoxide; the γ-haloalkyl-γ-butanolides thus obtained can be further transformed into various products. Graphical Abstract

CoMFA, synthesis, and pharmacological evaluation of (E)-3-(2-carboxy-2- arylvinyl)-4,6-dichloro-1H-indole-2-carboxylic acids: 3-[2-(3-Aminophenyl)-2- carboxyvinyl]-4,6-dichloro-1H-indole-2-carboxylic acid, a potent selective glycine-site NMDA receptor antagonist

Baron, Bruce M.,Cregge, Robert J.,Farr, Robert A.,Friedrich, Dirk,Gross, Raymond S.,Harrison, Boyd L.,Janowick, David A.,Matthews, Donald,McCloskey, Timothy C.,Meikrantz, Scott,Nyce, Philip L.,Vaz, Roy,Metz, William A.

, p. 995 - 1018 (2007/10/03)

(E)-3-(2-Carboxy-2-phenylvinyl)-4,6-dichloro-1H-indole-2-carboxylic acid, 1, is a potent and selective antagonist of the glycine site of the N-methyl-D-aspartate (NMDA) receptor. Using 3D comparative molecular field analysis (CoMFA) to guide the synthetic effort, a series of aryl diacid analogues of 1 were synthesized to optimize in vivo potency, duration of action, and binding activity. It was found that the incorporation of a substituted aromatic with an electron withdrawing group or a heterocyclic group at the 2-position of the 3-propenyl moiety of 1 gave compounds with better affinity and potency in the murine stroke model. Ultimately this led to the discovery of 3-[2-(3-aminophenyl)-2-carboxyvinyl]-4,6-dichloro-1H-indole-2-carboxylic acid, 19, as a new potent selective glycine-site NMDA receptor antagonist.

Reaction of Silyl Enol Ethers with Arenediazonium Salts. Part 2. α-Amination of Esters

Sakakura, Toshiyasu,Hara, Masayasu,Tanaka, Masato

, p. 289 - 294 (2007/10/02)

Diazonium salts efficiently serve as electrophilic aminating reagents of esters.The reaction of arenediazonium tetrafluoroborates with ketene silyl ketals yielded α-azo or α-hydrazono esters in good to excellent yields under very mild conditions.Hydrogenation of those esters gave α-amino esters quantitatively.

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