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188729-96-6

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188729-96-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 188729-96-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,7,2 and 9 respectively; the second part has 2 digits, 9 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 188729-96:
(8*1)+(7*8)+(6*8)+(5*7)+(4*2)+(3*9)+(2*9)+(1*6)=206
206 % 10 = 6
So 188729-96-6 is a valid CAS Registry Number.

188729-96-6Relevant articles and documents

Radical-induced opening of trisubstituted epoxides: Application in the synthesis of C1-C12 segment of epothilones

Chakraborty,Dutta

, p. 101 - 104 (2007/10/03)

Diastereo- and regioselective opening of a trisubstituted epoxy ketone at the more substituted carbon using samarium(II) iodide presents an alternate approach to the C5-C7 aldol moiety with β-hydroxyketo framework in the stereoselective synthesis of C1-C12 segment of epothilones.

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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