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144689-23-6

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144689-23-6 Usage

Uses

Olmesartan Acid Ethyl Ester is a impurity of Olmesartan Acid, an angiotensin II receptor antagonist.

Check Digit Verification of cas no

The CAS Registry Mumber 144689-23-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,6,8 and 9 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 144689-23:
(8*1)+(7*4)+(6*4)+(5*6)+(4*8)+(3*9)+(2*2)+(1*3)=156
156 % 10 = 6
So 144689-23-6 is a valid CAS Registry Number.

144689-23-6Relevant articles and documents

Preparation method of high-purity triphenyl olmesartan ethyl ester

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, (2019/11/25)

The invention provides a preparation method of a high-purity olmesartan medoxomil intermediate triphenyl olmesartan ethyl ester. The provided preparation method specifically comprises the steps that in a first solvent, in the presence of a combined catalyst and potassium carbonate, a compound shown in a formula 2 and a compound shown in a formula 3 react with each other to obtain a compound shownin a formula 1, wherein the combined catalyst is composed of polyethylene glycol and 2-methylpyrrolidone. The preparation method can significantly reduce the content of the impurities shown in a formula 4 and formula 5 in the product intermediate shown in the formula 1, and improve the purity of the intermediate shown in the formula 1.

DEPROTECTION METHOD FOR TETRAZOLE COMPOUND

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, (2015/09/23)

The present invention relates to a method of deprotecting a tetrazole compound, useful as an intermediate for angiotensin II receptor blockers, and provides a novel production method of angiotensin II receptor blockers. Provided is a production method of a compound represented by the formula [3] or [4] or a salt thereof, including (i) reducing a compound represented by the formula [1] or [2] or a salt thereof in the presence of a metal catalyst and an alkaline earth metal salt, or (ii) reacting the compound with a particular amount of Br?nsted acid: wherein each symbol is as defined in the present specification.

Novel and efficient debenzylation of N-benzyltetrazole derivatives with the rosenmund catalyst

Seki, Masahiko

, p. 3249 - 3255 (2015/01/08)

The Rosenmund catalyst (Pd/BaSO4) was found to efficiently catalyze debenzylation of N-benzyltetrazole derivatives with ammonium formate by catalytic transfer hydrogenation under mild conditions. The protocol has been applied to functionalized substrates to provide various angiotensin II receptor blockers in excellent yields.

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