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344236-68-6

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344236-68-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 344236-68-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,4,4,2,3 and 6 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 344236-68:
(8*3)+(7*4)+(6*4)+(5*2)+(4*3)+(3*6)+(2*6)+(1*8)=136
136 % 10 = 6
So 344236-68-6 is a valid CAS Registry Number.

344236-68-6Relevant articles and documents

2,4-Diamino-5-benzylpyrimidines as Antibacterial Agents. 4. 6-Substituted Trimethoprim Derivatives from Phenolic Mannich Inetrmediates. Application to the Synthesis of Trimethoprim and 3,5-Dialkylbenzyl Analogues

Roth, Barbara,Aig, Edward,Lane, Kenneth,Rauckman, Barbara S.

, p. 535 - 541 (2007/10/02)

The preparation of a wide variety of 6-substituted trimethoprim analogues was readily accomplished by the reaction of 2,4-diamino-6-substituted-pyrimidines with 2,6-dimethoxy-4-phenol at 120-160 deg C.The less reactive 2,6-dialkyl-4-phenols reacted successfully with 2,4-diamino-6-(alkylthio)pyrimidines to give 5-(substituted benzyl)pyrimidines.The phenolic groups of the products were alkylated in high yield when a nonreactive 6-substituent was present in the pyrimidine ring. 6-(Alkylthio) groups were easily removed with Raney nickel.Trimethoprim was thus obtained in high yield from its 6-(methylthio) counterpart.The 6-substituted trimethoprim analogues all had low activity as inhibitors of Escherichia coli dihydrofolate reductase and as antibacterial agents.

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