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157756-27-9

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157756-27-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157756-27-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,5 and 6 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 157756-27:
(8*1)+(7*5)+(6*7)+(5*7)+(4*5)+(3*6)+(2*2)+(1*7)=169
169 % 10 = 9
So 157756-27-9 is a valid CAS Registry Number.

157756-27-9Relevant articles and documents

Model reactions targeted at the synthesis of carbon-14 labeled CI-996, a potent antagonist of angiotensin II receptor (1)

Ekhato,Huang

, p. 213 - 220 (1994)

A reaction sequence suitable for the preparation of an analog of 2-propyl-1-[[2'-(1H-tetrazol-5-yl)[1,1'-biphenyl]-4-yl]methyl-4-[2-(tr ifluoroacetyl)-1H-pyrrol-1-yl]-1H-imidazole-5-carboxylic acid, with 14C at the methylene bridge was developed. The would-be labeled fragment (12) was derived from 4-iodobenzenemethanol (6) which itself was constructed from 1,4-dibromobenzene by the application of silicon chemistry. Pd(o) catalyzed coupling of TBDMS protected 6 and a tetrazole borate 10 gave the compound 12 which upon further transformation to the mesylate 13, N-alkylated an imidazole to furnish target compound.

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