unique biological activity, make the natural occurring apoptolidin (1) a challenging synthetic target. The retrosynthetic analysis revealed five key building blocks-three for the construction of the macrolide ring B and two prospective pendant saccharide units-which were synthesized in a highly convergent manner and then connected. Apoptolidin's rather labile nature proved particularly challenging in
Total Synthesis of Apoptolidin: Construction of Enantiomerically Pure Fragments
作者:K. C. Nicolaou、Konstantina C. Fylaktakidou、Holger Monenschein、Yiwei Li、Bernd Weyershausen、Helen J. Mitchell、Heng-xu Wei、Prasuna Guntupalli、David Hepworth、Kazuyuki Sugita
DOI:10.1021/ja0304953
日期:2003.12.1
A general strategy for the totalsynthesis of the antitumor agent apoptolidin (1) is proposed, and the chemical synthesis of the defined key building blocks (4, 5, 6, 8, and 9) in their enantiomerically pure forms is described. The projected totalsynthesis calls for a dithiane coupling reaction to construct the C(20)-C(21) bond, a Stille coupling reaction to form the C(11)-C(12) bond, and a Yamaguchi