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193146-27-9

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193146-27-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 193146-27-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,3,1,4 and 6 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 193146-27:
(8*1)+(7*9)+(6*3)+(5*1)+(4*4)+(3*6)+(2*2)+(1*7)=139
139 % 10 = 9
So 193146-27-9 is a valid CAS Registry Number.

193146-27-9Relevant articles and documents

Total syntheses of epothilones A and B via a macrolactonization-based strategy

Nicolaou,Ninkovic,Sarabia,Vourloumis,He,Vallberg,Finlay,Yang

, p. 7974 - 7991 (2007/10/03)

The total syntheses of epothilones A (1) and B (2) and several analogues thereof are described. The reported strategy relies on a macrolactonization approach and features selective epoxidation of the macrocycle double bond in precursors 3 and 4 (Scheme 1), respectively, as well as high convergency and flexibility. Building blocks 9-12 and 15 were constructed by asymmetric processes and coupled via Wittig, aldol, and macrolactonization reactions to afford the basic skeleton of epothilones and that of several of their analogues by a relatively short route. The utilization ofintermediate 14, obtained via a stereoselective Wittig reaction and its Enders coupling to SAMP hydrazone 13 (Scheme 8), in combination with a stereoselective aldol reaction with the modified substrate 69 (Scheme 10) improved the stereoselectivity and efficiency of the total synthesis of these new and highly potent microtubule binding antitumor agents.

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