Synthesis of the macrolactone core of (+)-neopeltolide by transannular cyclization
作者:Gangavaram V. M. Sharma、Sheri Venkat Reddy、Kallaganti V. S. Ramakrishna
DOI:10.1039/c2ob25151e
日期:——
The synthesis of the macrolactone core of (+)-neopeltolide has been achieved. The key synthetic strategy involves the highly diastereoselective synthesis of the 2,6-cis-disubstituted tetrahydropyran ring by a transannular cyclization of δ-hydroxy alkene using mercuric trifluoroacetate. Two of the six stereocenters C-5 and C-11 were realized from L-malic acid, while the remaining stereocenters C-3 (Sharpless
已经实现了(+)-新邻苯二酚内酯大内酯核心的合成。关键的合成策略涉及使用三氟乙酸汞通过δ-羟基烯烃的环空环化,高度非对映选择性地合成2,6-顺式-二取代的四氢吡喃环。六个立体中心C-5和C-11中的两个是从L-苹果酸,而其余的立体中心C-3(无尖锐的不对称环氧化),C-7(环过环化),C-9(区域选择性环氧化物开口)和C-13(螯合受控还原)是通过不对称合成得到的。大环内酯环是通过使用RCM协议的大环化合成的。