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158195-43-8

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158195-43-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 158195-43-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,1,9 and 5 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 158195-43:
(8*1)+(7*5)+(6*8)+(5*1)+(4*9)+(3*5)+(2*4)+(1*3)=158
158 % 10 = 8
So 158195-43-8 is a valid CAS Registry Number.

158195-43-8Relevant articles and documents

Total synthesis of a conformationally constrained didemnin B analog

Xiao,Vera,Liang,Joullie

, p. 2734 - 2742 (2007/10/03)

The total synthesis of a didemnin B analogue containing a conformationally constrained replacement for the isostatine moiety is reported. Synthetic highlights include an improved preparation of 2-hydroxy-3-cyclohexenecarboxylic acid and a new strategy for accessing the macrocycle.

Synthetic studies of a constrained ring didemnin analog

Mayer,Pfizenmayer,Cordova,Li,Joullie

, p. 519 - 522 (2007/10/02)

An asymmetric Diels-Alder reaction in the presence of 3.0 M lithium perchlorate-diethyl ether was used to generate the initial stereochemistry for a cyclohexane amino acid (3), a key intermediate in the preparation of a fused ring didemnin analog. This constrained ring macrocycle should provide insight into the binding site conformation of the bioactive species.

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