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139260-71-2

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139260-71-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 139260-71-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,9,2,6 and 0 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 139260-71:
(8*1)+(7*3)+(6*9)+(5*2)+(4*6)+(3*0)+(2*7)+(1*1)=132
132 % 10 = 2
So 139260-71-2 is a valid CAS Registry Number.

139260-71-2Relevant articles and documents

Synthesis of 11-Amino-substituted-9-methoxy-5-methyl-6H-pyridocarbazoles

Praly-Deprez, Isabelle,Rivalle, Christian,Huel, Christiane,Belehradek, Jean,Paoletti, Claude,Bisagni, Emile

, p. 3165 - 3171 (2007/10/02)

A route to 11-amino-substituted-6H-pyridocarbazoles has been studied.Thus, condensation of 2-(4-lithiopyridine-3-yl)-4,4-dimethyloxazoline with 2-acetyl-5-methoxy-1-phenylsulphonylindole led to a low yield of the expected alcohol, which upon hydrolysis gave a complex mixture.A better starting building block was 4-acetyl-N,N-diisopropylnicotinamide obtained either from N,N-diisopropyl-4-lithionicotinamide (low yield) or from pyridine-3,4-dicarboxylic anhydride, using a 4-step sequence.This compound was treated with 2-lithio-5-methoxy-1-phenylsulphonylindole, affording N,N-diisopropyl-4-nicotinamide.Hydrolysis and then reduction led to 4-nicotinic acid whose amides were cyclized by phosphorus trichlorideoxide.Finally, the title compounds were obtained by Raney-nickel reduction-elimination of the 6-phenylsulphonyl protecting group.

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