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342417-07-6

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342417-07-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 342417-07-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,2,4,1 and 7 respectively; the second part has 2 digits, 0 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 342417-07:
(8*3)+(7*4)+(6*2)+(5*4)+(4*1)+(3*7)+(2*0)+(1*7)=116
116 % 10 = 6
So 342417-07-6 is a valid CAS Registry Number.

342417-07-6Relevant articles and documents

Efficient synthesis of novel NK1 receptor antagonists: Selective 1,4-addition of Grignard reagents to 6-chloronicotinic acid derivatives

Hoffmann-Emery, Fabienne,Hilpert, Hans,Scalone, Michelangelo,Waldmeier, Pius

, p. 2000 - 2008 (2007/10/03)

A new efficient synthesis of two novel classes of NK1 receptor antagonists, among them befetupitant and netupitant, starting from 6-chloronicotinic acid is described. The introduction of the o-tolyl substituent at C(4) of the pyridine ring was achieved by a one-pot selective 1,4-Grignard addition/oxidation sequence to 6-chloronicotinic acid or a derivative of it. The scope of this addition/oxidation sequence was examined. It was also shown that the carboxylic function can be converted to a methyl amino group by a Hofmann rearrangement followed by reduction. Furthermore, a new high-yielding synthesis of 2-(3,5-bistrifluoromethylphenyl)-2-methyl propionic acid based on the carbonylation of the tertiary alcohol obtained by Grignard addition of 3,5-bis(trifluoromethyl)bromobenzene to acetone was established.

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