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203174-51-0

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203174-51-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 203174-51-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,1,7 and 4 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 203174-51:
(8*2)+(7*0)+(6*3)+(5*1)+(4*7)+(3*4)+(2*5)+(1*1)=90
90 % 10 = 0
So 203174-51-0 is a valid CAS Registry Number.

203174-51-0Relevant articles and documents

Approaching the C33-C38 fragments of amphotericin B and nystatin by a retro-[1,4]-Brook rearrangement and the stereoselective manipulation of the resulting allylsilane

Gibson, Christoph,Buck, Thomas,Walker, Martina,Brückner, Reinhard

, p. 201 - 205 (2007/10/03)

Sulfide S-4 (98.6% ee) furnished allylsilane S,S-anti-2 through a potassium naphthalenide induced, highly stereoselective retro-Brook rearrangement. Treatment with diethylborane followed by NaOOH/H2O2 delivered alcohol 9 as a single diastereomer. Cylization (→10), oxidation (→16), and methylation gave ketone 17. Reduction of 17 with Et3SiH in CF3CO2H was accompanied by an unprecedented rearrangement of the neighboring oxasilolane ring to the C-silylated tetrahydropyran 20. It was oxidized to alcohol 21 which - if one inverted its OH group - would become a new C33-C38 building block for the polyol/polyene antibiotics amphotericin B and nystatin.

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