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139588-82-2

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139588-82-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139588-82-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,5,8 and 8 respectively; the second part has 2 digits, 8 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 139588-82:
(8*1)+(7*3)+(6*9)+(5*5)+(4*8)+(3*8)+(2*8)+(1*2)=182
182 % 10 = 2
So 139588-82-2 is a valid CAS Registry Number.

139588-82-2Relevant articles and documents

Lithiation of 4-Methoxy-2-pyridones. Synthetic Entry to Tenellin and Funiculosin, and Related Natural 3,5-Disubstituted 4-Oxy-2-pyridones

Buck, Judith,Madeley, J. Paul,Pattenden, Gerald

, p. 67 - 73 (2007/10/02)

Lithiation of 4-methoxy-2-pyridone with butyllithium at -78 deg C occurs at the C-3 position exclusively.Subsequent reactions with MeOD, MeI, CO2, benzaldehyde or (E)-but-2-enal then lead to the corresponding C-3-substituted derivatives. in a one-pot procedure, treatment of 1,2-dihydro-4-methoxy-1-methyl-2-oxopyridine-3-carboxylic acid with ammonia in the presence of a polyphosphate buffer at 80 deg C produced natural ricinine in 58percent overall yield.A convenient three-step synthesis of 5-aryl- and 5-alkyl-substituted 4-methoxy-2-pyridones is described.Lithiation of these substrates, followed by reaction with electrophiles, provided a convenient route to 3,5-disubstituted 4-oxy-2-pyridones, and a synthetic entry to natural products, e. g. tenellin and funiculosin, containing this structural feature.

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