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18758-48-0

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18758-48-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 18758-48-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,7,5 and 8 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 18758-48:
(7*1)+(6*8)+(5*7)+(4*5)+(3*8)+(2*4)+(1*8)=150
150 % 10 = 0
So 18758-48-0 is a valid CAS Registry Number.

18758-48-0Relevant articles and documents

Apoptolidin A: Total synthesis and partially glycosylated analogues

Wehlan, Hermut,Dauber, Mario,Fernaud, M. Teresa Mujica,Schuppan, Julia,Keiper, Sonja,Mahrwald, Rainer,Garcia, M.-Elisa Juarez,Koert, Ulrich

, p. 7378 - 7397 (2006)

The total synthesis of apoptolidin A is described employing an early glycosylation strategy. Strategic disconnections were chosen between C11-C12 (cross-coupling) and C19O-C1 (macrocyclization). The cis-selective glycosylation at C9-OH was achieved with the new SIBA protective group at O2/O3 of the L-glucose residue. Auxiliary substitutents at the 2-position of the 2-deoxy sugars were applied to form selectively the glycosidic linkages of the C27 disaccharide. The cross-coupling of the glycosylated northern half with the glycosylated southern half was achieved with Cu1-thiophene carboxylate. The macrocyclization of a trihydroxy carboxylic acid produced the 20-membered macrolide selectively. H2SiF6 was suitable for the final deprotection of the silyl ethers and the conversion of the C21 methylketal into the hemiketal. The synthetic flexibility of the approach was proven by the synthesis of some glycovariants.

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