Synthesis of 1,2,4-trioxanes and 1,2,4-trioxepanes by N-halogenosuccinimide-mediated cyclisations of unsaturated hydroperoxyacetals
作者:Yoshihiro Ushigoe、Yoshihiro Kano、Masatomo Nojima
DOI:10.1039/a605616d
日期:——
Ozonolyses of vinyl ethers 1a–c in
CH2Cl2 in the presence of allylic and homoallylic
alcohols 3a–c give in each case the corresponding unsaturated
hydroperoxy acetals 4a–h, derived from capture of the carbonyl
oxides 2a–c by the unsaturated alcohols.
N-Halogenosuccinimide-mediated cyclisations of the
hydroperoxides give the corresponding 1,2,4-trioxanes and/or
1,2,4-trioxepanes, depending on the structure of the hydroperoxides and
the identity of the N-halogenosuccinimides.
乙烯醚1a–c在CH2Cl2中,在烯丙基和同烯丙基醇3a–c的存在下,通过臭氧化反应,分别得到相应的非饱和过氧化缩醛4a–h,这些产物来源于非饱和醇对羰基氧化物2a–c的捕获。通过N-卤代琥珀酰亚胺介导的环化反应,过氧化物生成相应的1,2,4-三氧杂环己烷和/或1,2,4-三氧杂环庚烷,具体取决于过氧化物的结构和N-卤代琥珀酰亚胺的种类。