Synthetic methods for unsymmetrically-substituted 1,2,4,5-tetroxanes and of 1,2,4,5,7-pentoxocanes
作者:Hye-Sook Kim、Kaoru Tsuchiya、Yasuharu Shibata、Yusuke Wataya、Yoshihiro Ushigoe、Araki Masuyama、Masatomo Nojima、Kevin J. McCullough
DOI:10.1039/a900826h
日期:——
Ozonolysis of vinyl ethers 1a–c in the presence of hydrogen peroxide in diethyl ether gave the corresponding 1,1-bis(hydroperoxide)s 2a–c. Subsequent trimethylsilylation, followed by the TMSOTf-catalyzed cyclocondensation with carbonyl compounds gave the unsymmetrically-substituted 1,2,4,5-tetroxanes 5–14. Similarly, the 1,2,4,5,7-pentoxocanes 18, 19 were prepared by the reaction of an α,α′-bis(trimethylsilylperoxy) ether 17 and carbonyl compounds. The tetroxane 14 showed notable antimalarial activity in vitro and in vivo.
在过氧化氢存在下,乙烯基醚 1a-c 在二乙醚中进行臭氧分解,得到相应的 1,1-双(过氧化氢)2a-c。随后进行三甲基硅烷化反应,然后在 TMSOTf 催化下与羰基化合物进行环缩合反应,得到不对称取代的 1,2,4,5-四氧杂环己烷 5-14。同样,α,α′-双(三甲基硅基过氧)醚 17 与羰基化合物反应制备出了 1,2,4,5,7-戊氧杂环烷 18 和 19。四环醚 14 在体外和体内都显示出显著的抗疟活性。