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57043-01-3

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57043-01-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 57043-01-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,7,0,4 and 3 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 57043-01:
(7*5)+(6*7)+(5*0)+(4*4)+(3*3)+(2*0)+(1*1)=103
103 % 10 = 3
So 57043-01-3 is a valid CAS Registry Number.

57043-01-3Relevant articles and documents

Radical cyclization in heterocycle synthesis. Part 13: Sulfanyl radical addition-cyclization of oxime ethers and hydrazones connected with alkenes for synthesis of cyclic β-amino acids

Miyata, Okiko,Muroya, Kanami,Kobayashi, Tomoko,Yamanaka, Rina,Kajisa, Seiko,Koide, Junko,Naito, Takeaki

, p. 4459 - 4479 (2002)

A combination of sulfanyl radical addition-cyclization of the oxime ethers and hydrazones connected with alkenes and subsequent conversion of a phenylsulfanylmethyl group to a carboxyl group provides a novel method for the construction of the cyclic β-amino acids. Upon treatment with thiophenol in the presence of AIBN, the oxime ethers and hydrazones smoothly underwent sulfanyl radical addition-cyclization to give the 2-(phenylsulfanylmethyl)cycloalkylamine. This method was successfully applied to the practical synthesis of 2-aminocyclopentanecarboxylic acid and 4-amino-3-pyrrolidinecarboxylic acid.

A novel preparation of 2-aminocyclopentanecarboxamides

Csomos, Peter,Bernath, Gabor,Fueloep, Ferenc

, p. 1077 - 1084 (2007/10/03)

Different syntheses of cis- and trans-2-aminocyclopentanecarboxamides were studied. A convenient and effective method was devised for the preparation of cis-2-aminocyclopentanecarboxamide derivatives starting from the readily available 6-tert-butoxycarbon

An improved synthesis of enantiopure β-amino acids

Cimarelli,Palmieri,Volpini

, p. 2943 - 2953 (2007/10/03)

An improved method for the preparation of both the enantiopure β-amino acids is presented. The diastereomer benzyl β-amino esters, obtained by stereoselective reduction of β-enamino esters, were separated and hydrogenolyzed to the free enantiopure β-amino acids.

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