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.