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205526-56-3

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205526-56-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 205526-56-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,5,2 and 6 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 205526-56:
(8*2)+(7*0)+(6*5)+(5*5)+(4*2)+(3*6)+(2*5)+(1*6)=113
113 % 10 = 3
So 205526-56-3 is a valid CAS Registry Number.

205526-56-3Relevant articles and documents

Stereocontrolled preparation of cis- and trans-2,6-dialkylpiperidines via diastereoselective reaction of 1-aza-4-oxabicyclo[4.3.0]nonane derivatives with Grignard reagents

Poerwono, Hadi,Higashiyama, Kimio,Yamauchi, Takayasu,Kubo, Hajime,Ohmiya, Shigeru,Takahashi, Hiroshi

, p. 13955 - 13970 (2007/10/03)

We report here the syntheses of cis- and trans-2,6-disubstituted piperidines using chiral 1-aza-4-oxabicyclo[4.3.0]nonane synthon 1, which shows high reactivity toward nucleophilic attack at its C-5 position. Bicyclic compounds resembling synthon 1 were transformed to cis- and trans- 2,6-disubstituted piperidine derivatives via reactions with various Grignard reagents in a stereospecific manner. Using this methodology, (+)-solenopsin A (2b) and both enantiomers of isosolenopsin A (3a and 3b) were synthesized in an enantioselective manner from a single enantiomeric source.

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