A convergent total synthesis of (-)-apicularen A, a highly cytostatic 12-membered macrolide, has been accomplished. The key steps include assembling of iodoalkene 8 and aldehyde 9 by Nozaki-Hiyama-Kishi (NHK) coupling, stereospecific construction of 2,6-trans-disubstituted dihydropyran by Pd(II)-catalyzed 1,3-chirality transfer reaction, and Yamaguchi macrolactonization. Introduction of the (2Z,42)-heptadienamide moiety in the side chain by an efficient Cu(I)-mediated coupling completed the total synthesis.
Total Synthesis and Biological Evaluation of (−)-Apicularen A and Its Analogues
作者:Sanjay S. Palimkar、Jun’ichi Uenishi、Hiromi Ii
DOI:10.1021/jo2019762
日期:2012.1.6
The totalsynthesis of (−)-apicularen A (1), a highly cytostatic 12-membered macrolide, and its analogues is described. The convergent and distinct approach not only provides 1, but also opens the opportunity to synthesizeC10–C11 functional analogues of 1. The key steps of the totalsynthesis include assembling of iodoalkene 12 and aldehyde 13by Nozaki–Hiyama–Kishi (NHK) coupling, stereospecific construction