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481656-13-7

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481656-13-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 481656-13-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,8,1,6,5 and 6 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 481656-13:
(8*4)+(7*8)+(6*1)+(5*6)+(4*5)+(3*6)+(2*1)+(1*3)=167
167 % 10 = 7
So 481656-13-7 is a valid CAS Registry Number.

481656-13-7Downstream Products

481656-13-7Relevant articles and documents

Enantioselective total synthesis of (+)-stachyflin: A potential anti-influenza a virus agent isolated from a microorganism

Sakurai, Junji,Kikuchi, Takuya,Takahashi, Ohgi,Watanabe, Kazuhiro,Katoh, Tadashi

, p. 2948 - 2957 (2011/06/26)

A novel and potent hemagglutinin inhibitor, (+)-stachyflin, was efficiently synthesized in an enantioselective manner starting from the (+)-5-methyl-Wieland-Miescher ketone. The synthetic method features a BF 3·Et2O-induced cascade epoxide-opening/ rearrangement/cyclization reaction tostereoselectively construct the requisite pentacyclic ring system in one step. In order to rationalize the mechanism of the cascade reaction, quantum chemical calculations of the possible intermediary carbocations and transition states in the model synthesis were carried out. An alternative approach to synthesize (+)-stachyflin by employing a similar cascade reaction was also described. A potential anti-influenza A virus agent, (+)-stachyflin, a novel hemagglutinin inhibitor, has been synthesized in an enantioselective manner for the first time starting from (+)-5-methyl-Wieland- Miescher ketone. The method features a BF3·Et 2O-induced cascade epoxide-opening/rearrangement/cyclization reaction to construct the requisite pentacyclic ring system in one step.

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