申请人:Njardarson Jon
公开号:US08404872B2
公开(公告)日:2013-03-26
Vinyl oxiranes are rearranged to 2,5-dihydrofuran using catalyst (III) or (IV). The 2,5-dihydrofuran can be reduced to tetrahydrofuran. 3,4-Epoxy-1-butene substrate is converted to 2,5-dihydrofuran which in turn is converted to tetrahydrofuran. Substrate for making 3-methyltetrahydrofuran is prepared from isoprene. Substrate for making 2-methyltetrahydrofuran is prepared from piperylene. Reactions analogous to that with vinyl oxiranes are carried out with vinyl thiiranes and vinyl aziridines.
使用催化剂(III)或(IV)将乙烯环氧烷重排成2,5-二氢呋喃。2,5-二氢呋喃可以被还原成四氢呋喃。3,4-环氧-1-丁烯底物被转化为2,5-二氢呋喃,随后被转化为四氢呋喃。制备3-甲基四氢呋喃的底物来自异戊二烯。制备2-甲基四氢呋喃的底物来自戊二烯。类似于乙烯环氧烷的反应也可以用于乙烯硫脲和乙烯氮杂环丙烷。