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131828-51-8

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131828-51-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131828-51-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,8,2 and 8 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 131828-51:
(8*1)+(7*3)+(6*1)+(5*8)+(4*2)+(3*8)+(2*5)+(1*1)=118
118 % 10 = 8
So 131828-51-8 is a valid CAS Registry Number.

131828-51-8Relevant articles and documents

Synthesis of 2,5-Dioxygenated Pyrazine 4-Oxides: Total Synthesis of a New Inhibitor of Superoxide Anion Generation, OPC-15161

Kita, Yasuyuki,Akai, Shuji,Fujioka, Hiromichi,Tamura, Yasumitsu,Tone, Hitoshi,Taniguchi, Youichi

, p. 875 - 884 (2007/10/02)

The total synthesis of OPC-15161 1, a new inhibitor of superoxide anion generation, is described in full.Three approaches, routes A-C, have been investigated focusing on the pivotal structure 2,5-dioxygenated pyrazine 4-oxide.Among them, route A led to the total synthesis of 1.That is, the key precursor, 5-hydroxypyrazin-2(1H)-one 4-oxide 7 has been prepared from tryptophan methyl ester 2 in three steps, and direct methylation of the 5-hydroxy group of 7 or three-step methylation via the 2-O-Boc derivative 10 afforded 1 in 9.9-10.6percent overall yields.

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