作者:Hong-Xia Jin、Qi Zhang、Hye-Sook Kim、Yusuke Wataya、He-Hua Liu、Yikang Wu
DOI:10.1016/j.tet.2006.05.065
日期:2006.8
group. When the electron-withdrawing group in the Michael acceptor was a nitro group, the closure of the peroxy ring occurred readily under the hydroxidation conditions. Presence of a benzene ring fused to the peroxy ring effectively reduced the degrees of freedom in the transition state for the ring-closure step and made the otherwise very difficult seven-membered 1,2-dioxepane rather easy to form
设计和合成了几种螺过氧抗疟疾化合物,使用过氧化氢在UHP中(脲-H 2 O 2络合物)作为过氧键的来源。掺入H 2 O 2在当前情况下,由于在酮羰基上存在羟基γ或δ,形成五元或六元环状半缩酮的可能性极大地促进了通过缩酮交换反应进入有机分子骨架。当迈克尔受体中的吸电子基团是硝基时,在水氧化条件下,过氧环的闭合很容易发生。与过氧环稠合的苯环的存在有效地降低了闭环步骤过渡态的自由度,并使原本非常困难的七元1,2-二氧戊环很容易通过分子内迈克尔加成而形成。