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861997-61-7

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861997-61-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 861997-61-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,6,1,9,9 and 7 respectively; the second part has 2 digits, 6 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 861997-61:
(8*8)+(7*6)+(6*1)+(5*9)+(4*9)+(3*7)+(2*6)+(1*1)=227
227 % 10 = 7
So 861997-61-7 is a valid CAS Registry Number.

861997-61-7Relevant articles and documents

Ester dienolate [2,3]-Wittig rearrangement in natural product synthesis: Diastereoselective total synthesis of the triester of viridiofungin A, A 2, and A4

Pollex, Annett,Millet, Agnes,Mueller, Jana,Hiersemann, Martin,Abraham, Lars

, p. 5579 - 5591 (2007/10/03)

An ester dienolate [2,3]-Wittig rearrangement was utilized to access the alkylated citric acid skeleton 6 that is characteristic for the viridiofungins and other members of the alkyl citrate family of secondary natural products. The [2,3]-sigmatropic rearrangement of (Z,Z)-15 provided the rearrangement product (±)-syn-16 in moderate yield and with very good diastereoselectivity. A Julia-Kocienski olefination efficiently served to connect the polar head (±)-syn-26 with the lipophilic tail (32a-c) of the viridiofungins. Amide formation between the racemic viridiofungin precursors 35a-c and the enantiomerically pure amino acid L-tyrosine methyl ester followed by preparative reversed-phase HPLC provided the isopropyl dimethyl ester of viridiofungin A ((+)-39a), A2 ((+)-39b), and A4 ((+)-39c) as well as the nonnatural diastereomers (-)-38a-c.

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