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251089-58-4

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251089-58-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 251089-58-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,1,0,8 and 9 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 251089-58:
(8*2)+(7*5)+(6*1)+(5*0)+(4*8)+(3*9)+(2*5)+(1*8)=134
134 % 10 = 4
So 251089-58-4 is a valid CAS Registry Number.

251089-58-4Relevant articles and documents

Total synthesis of the ansamycin antibiotic (+)-thiazinotrienomycin E

Smith III, Amos B.,Wan, Zehong

, p. 3738 - 3753 (2000)

The first total synthesis of (+)-thiazinotrienomycin E (1), member of a novel class of cytotoxic ansamycin antibiotics, has been achieved. Key features of the synthetic strategy include (a) the efficient construction of sulfone 7 incorporating TBS protection of the aniline, (b) an improved synthesis of allyl chloride (-)-6, the advanced intermediate employed in our trienomycins A and F total syntheses, (c) application of the Kocienski modified Julia protocol to elaborate the E,E,E-triene subunit in a stereo- controlled fashion, (d) an efficient union of sulfone 7 with advanced iodide 62, and (e) Mukaiyama macrolactamization to access the thiazinotrienomycin macrocyclic ring.

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