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443127-32-0

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443127-32-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 443127-32-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,3,1,2 and 7 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 443127-32:
(8*4)+(7*4)+(6*3)+(5*1)+(4*2)+(3*7)+(2*3)+(1*2)=120
120 % 10 = 0
So 443127-32-0 is a valid CAS Registry Number.

443127-32-0Relevant articles and documents

Toward a general strategy for the synthesis of 3,4-dihydroxyprolines from pentose sugars

Taylor, Carol M.,Taylor, Carol M.,Barker, William D.,Weir, Claudette A.,Park, Jae H.

, p. 4466 - 4474 (2007/10/03)

A general strategy is proposed, wherein a pentose sugar γ-lactone can be converted, via a series of nine reactions, to a 3,4-dihydroxyproline, suitably protected for use in peptide synthesis. Thus, D-ribonolactone (6) has been converted to N-fluorenylmethoxycarbonyl-3,4-di-O-tert-butyldimethylsilyloxy-D-2,3-cis-3, 4-cis-proline (7) in 18.9% overall yield. Likewise, L-arabinonolactone (11) has been converted to N-fluorenylmethoxycarbonyl-3,4-di-O-tert-butyldimethylsilyloxy-L-2,3-cis-3, 4-trans-proline (36) in 13.7% overall yield and L-lyxonolactone (12) to N-fluorenylmethoxycarbonyl- 3,4-di-O-tert-butyldimethylsilyloxy-L-2,3-trans-3,4-cis-proline (37) in 11.2% overall yield. These building blocks have also been fully deprotected to give the free amino acids. We believe that this series of reactions ought to be applicable to the synthesis of any of the eight stereoisomers of 3,4-dihydroxyproline, by judicious selection of the pentose starting material.

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