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168072-11-5

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168072-11-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 168072-11-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,8,0,7 and 2 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 168072-11:
(8*1)+(7*6)+(6*8)+(5*0)+(4*7)+(3*2)+(2*1)+(1*1)=135
135 % 10 = 5
So 168072-11-5 is a valid CAS Registry Number.

168072-11-5Relevant articles and documents

Application of highly stereocontrolled glycosidations employing 2,6-anhydro-2-thio sugars to the syntheses of erythromycin A and olivomycin A trisaccharide

Toshima, Kazunobu,Nozaki, Yuko,Mukaiyama, Satsuki,Tamai, Tetsuro,Nakata, Masaya,Tatsuta, Kuniaki,Kinoshita, Mitsuhiro

, p. 3717 - 3727 (1995)

The highly efficient syntheses of the erythromycin A (1) from its aglycon, (9S)-9-dihydroerythronolide A (4), and the C-D-E trisaccharide 3 of olivomycin A have been accomplished by the successful application of stereocontrolled glycosidations using 2,6-anhydro-2-thio sugars. The former synthesis includes the highly α-stereoselective glycosidation of the C5 desosaminated lactone 12 with phenyl 2,6-anhydro-4-O-benzyl-3-C-methyl-3-O-methyl-1,2-dithio-L-altropyranos ide (10), which was achieved by using NIS-TfOH. The latter synthesis involves both the highly β-stereoselective glycosidation of 1,3-di-O-acetyl-2,6-anhydro-4-O-benzyl-2-thio-β-D-altropyranose (23), which was realized by employing TMSOTf, and the highly α-stereoselective glycosidation of phenyl 2,6-anhydro-3-O-(diethylisopropylsilyl)-4-O-isobutyryl-3-C-methyl- 1,2-dithio-L-manno-pyranoside (24), which succeeded by utilizing NBS. Hydrogenolyses using Raney Ni as a catalyst and selective deprotections of the key glyco substances 17 and 22 led to the total syntheses of erythromycin A (1) and the C-D-E trisaccharide 3 of olivomycin A, respectively.

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