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645396-54-9

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645396-54-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 645396-54-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,5,3,9 and 6 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 645396-54:
(8*6)+(7*4)+(6*5)+(5*3)+(4*9)+(3*6)+(2*5)+(1*4)=189
189 % 10 = 9
So 645396-54-9 is a valid CAS Registry Number.

645396-54-9Relevant articles and documents

Stereoselective syntheses of 4-hydroxy 4-substituted glutamic acids

Tamura, Osamu,Shiro, Tomoya,Ogasawara, Mizuho,Toyao, Atsushi,Ishibashi, Hiroyuki

, p. 4569 - 4577 (2007/10/03)

The 4-hydroxy 4-substituted glutamic acid moiety is a common substructure of biologically important natural products such as monatin [(2S,4S)-2], lycoperdic acid (3), and dysiherbaine (4). To develop methodology for syntheses of these natural products, cycloadditions of nitrone 5 with 2-substituted 2-propen-1-ols 6 and 2-substituted acrylates 8 were investigated. Reactions of nitrone 5 with alcohols 6 in the presence of MgBr2OEt2 gave cycloadducts 7 in a highly stereoselective manner, whereas noncatalyzed reactions of 5 with acrylates 8 afforded adducts 9. Using the former reaction, syntheses of monatin [(2S,4S)-2], monatin derivative 18, and lycoperdic acid (3) were accomplished. The C4-epimer of monatin [(2S,4R)-2)] was also synthesized by employing the latter cycloaddition.

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