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267888-94-8

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267888-94-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 267888-94-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,6,7,8,8 and 8 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 267888-94:
(8*2)+(7*6)+(6*7)+(5*8)+(4*8)+(3*8)+(2*9)+(1*4)=218
218 % 10 = 8
So 267888-94-8 is a valid CAS Registry Number.

267888-94-8Relevant articles and documents

Total synthesis of (2S,3s,4R)-plakoridine A

Ma, Dawei,Sun, Haiying

, p. 1947 - 1950 (2000)

The β-amino ester 6 is synthesized via the diastereoselective Michael addition of the lithium amide derived from amine 5 to methyl (E)-2-hexenoate. This ester is converted to the pyrrolidinone 8 via an aldol condensation/deprotection/cyclization. Transformation of the lactam 8 into thiolactam 11 followed by Eschenmoser sulfide contraction provides (2S,3S,4R)-plakoridine A. (C) 2000 Elsevier Science Ltd.

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