The total synthesis of (−)-aplysin via a lithiation–borylation–propenylation sequence
作者:Catherine J. Fletcher、Daniel J. Blair、Katherine M.P. Wheelhouse、Varinder K. Aggarwal
DOI:10.1016/j.tet.2012.05.095
日期:2012.9
A concise, highly enantioselective synthesis of sesquiterpene natural products (−)-debromoaplysin and (−)-aplysin has been completed. The key steps included lithiation–borylation of a secondary benzylic carbamate to give a tertiary boronic ester followed by propenylation which installed the quaternary stereocenter with complete enantioselectivity. Subsequent RCM followed by deprotection and in situ
倍半萜烯天然产物(-)-溴代aplysinsin和(-)-aplysins的简洁,高对映选择性的合成已经完成。关键步骤包括锂化-仲氨基甲酸苄酯的硼化,生成叔硼酸酯,然后进行丙烯基化,从而完成对映体选择性的四级立体中心的安装。随后的RCM,然后进行脱保护和原位环化,产生具有良好非对映选择性的去溴粘蛋白,只需八步即可从中制备目标化合物。