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557091-81-3

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557091-81-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 557091-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,7,0,9 and 1 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 557091-81:
(8*5)+(7*5)+(6*7)+(5*0)+(4*9)+(3*1)+(2*8)+(1*1)=173
173 % 10 = 3
So 557091-81-3 is a valid CAS Registry Number.

557091-81-3Downstream Products

557091-81-3Relevant articles and documents

A concise approach to structurally diverse β-amino acids

Minter, Aaron R.,Fuller, Amelia A.,Mapp, Anna K.

, p. 6846 - 6847 (2007/10/03)

We have demonstrated that the high yields and selectivities of 1,3-dipolar cycloadditions can be translated into facile stereoselective syntheses of a diverse array of β-amino acids, key components of bioactive natural products, β-lactams, and peptidomimetics. Simply by selecting different combinations of three readily available starting materials (an oxime, a chiral allylic alcohol, and a nucleophile), we used the reaction sequence to prepare four different β-amino acid structural types with a variety of substitution patterns in good overall yield. Of particular note is the use of this approach to prepare highly substituted β-amino acids not readily accessible by previously reported methodologies. This will pave the way for future studies of the structure and function of this important class of molecules. Copyright

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