Sunthetic Studies of Microsclerodermins. A Stereoselective Synthesis of a Core Building Block for (2 S,3 R, 4 S,5 S,6 S, 11 E)-3-Amino-6-methyl-12-(4-methoxyphenyl)-2,4,5-trihydroxydodec-11-enoic Acid (AMMTD)
摘要:
A core building block 3 for (2S,3R,4S,5S,6S,11E)-3-aminod-methyl-12-(4-methoxyphenyl)-2,4,5-trihydroxydoda. -11-enoic acid (2, AMMTD) has been efficiently synthesized using the sharpless asymmetric dihydroxylation and the Dondoni's furan addition to a nitrone derivative as key steps. The 2-furyl group has been used as the carboxylsynthon. (C) 1997 Elsevier Science Ltd.
Total Syntheses of Epothilones A and B via a Macrolactonization-Based Strategy
作者:K. C. Nicolaou、S. Ninkovic、F. Sarabia、D. Vourloumis、Y. He、H. Vallberg、M. R. V. Finlay、Z. Yang
DOI:10.1021/ja971110h
日期:1997.8.1
The total syntheses of epothilones A (1) and B (2) and several analogues thereof are described. The reported strategy relies on a macrolactonizationapproach 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
Radical-induced Opening of Trisubstituted Epoxides: Application in the Synthesis of C1–C12 Segment of Epothilones
作者:T.K Chakraborty、S Dutta
DOI:10.1016/s0040-4039(97)10442-7
日期:1998.1
Diastereo- and regioselective opening of a trisubstituted epoxy ketone at the more substituted carbon using samarium(II) iodide presents an alternate approach to the C-5-C-7 aldol moiety with beta-hydroxyketo framework in the stereoselective synthesis of C-1-C-12 segment of epothilones. (C) 1997 Elsevier Science Ltd. All rights reserved.