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247184-60-7

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247184-60-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 247184-60-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,7,1,8 and 4 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 247184-60:
(8*2)+(7*4)+(6*7)+(5*1)+(4*8)+(3*4)+(2*6)+(1*0)=147
147 % 10 = 7
So 247184-60-7 is a valid CAS Registry Number.

247184-60-7Downstream Products

247184-60-7Relevant articles and documents

Expedient access to the okadaic acid architecture: A novel synthesis of the C1-C27 domain

Dounay,Urbanek,Frydrychowski,Forsyth

, p. 925 - 938 (2007/10/03)

A newly designed synthetic entry to the C1-C27 domain of okadaic acid has been developed. This incorporates substantial improvements in the preparations of the key okadaic acid building blocks representing the C3-C8, C9-C14, and C16-C27 portions. The synthesis of the C3-C8 lactone used (R)-glycidol as the origin of the C4 stereogenic center and featured a late-stage optional incorporation of the C7 hydroxyl group. The complementary C9-C14 fragment was synthesized in a concise route from (R)-3-tert-butyldimethylsilyloxy-2-methylpropanal and propargyl bromide. Assembly of the C3-C14 spiroketal-containing intermediate from the constituent fragments revealed a dramatic effect of C7 functionalization upon spiroketalization efficiency. In contrast, both (9E)- and (9Z)-enones converged readily to the C8 spiroketal upon treatment with acid. Modifications to the central C16-C27 fragment of okadaic acid included the early replacement of benzylic protecting groups by more suitable functionalities to facilitate both the generation of the C15-C27 intermediate and the deprotection of the final products. These modular building blocks were deployed for the synthesis of the C1-C27 scaffold of 7-deoxyokadaic acid. This work demonstrates improvements in the formation of versatile okadaic acid intermediates, as well as a reordering of fragment couplings. This alternative order of coupling was designed to promote the late stage incorporation of nonnatural lipophilic extensions from the C27 terminus.

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