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181578-02-9

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181578-02-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181578-02-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,5,7 and 8 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 181578-02:
(8*1)+(7*8)+(6*1)+(5*5)+(4*7)+(3*8)+(2*0)+(1*2)=149
149 % 10 = 9
So 181578-02-9 is a valid CAS Registry Number.

181578-02-9Relevant articles and documents

The synthesis of 5-substituted 3-benzoylamino-6-(2-substituted amino-1-ethenyl)-2H-pyran-2-ones and their transformations into 2H-pyrano[3,2-c]pyridine derivatives

Strah, Sonja,Svete, Jurij,Stanovnik, Branko

, p. 751 - 756 (2007/10/03)

A new approach to the 2H-pyrano[3,2-c]pyridine system is described, 5,6-Disubstituted 3-benzoylamino-2H-pyran-2-ones 3a,b, prepared from the corresponding 1,3-dicarbonyl compounds 1a,b and methyl (Z)-2-benzoylamino-3-dimethylaminopropenoate (2), were converted into 3-benzoylamino-6-(2-dimethylamino-1-ethenyl)-5-ethoxycarbonyl-2H-pyran-2-one (4a) and 5-acetyl derivative 4b. The exchange of the dimethylamino group in 4a,b with aromatic amines 5a-f,m, heteroaromatic amines 5g-i, and benzylamines 5j-1 produced 5-ethoxycarbonyl-3-benzoylamino-6-(2-arylamino- or heteroarylamino-or benzylamino-1-ethenyl)-2H-pyran-2-ones 6a-1, and its 5-acetyl analog 6m. The compounds 6 were cyclized in basic media into 2H-pyrano[3,2-c]pyridine derivatives 7a-h. Analogously react also α-amino acid derivatives 8a-c and 11 as nitrogen nucleophiles producing 9a-c, 10 and 12.

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