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    • 61. 发明授权
    • Preparation of pyrroles from dialkoxytetrahydrofurans
    • 从二烷氧基四氢呋喃制备吡咯
    • US4906758A
    • 1990-03-06
    • US231259
    • 1988-08-12
    • Wolfgang HoelderichMichael HesseHardo Siegel
    • Wolfgang HoelderichMichael HesseHardo Siegel
    • C07D207/32C07D207/323C07B43/04
    • C07D207/323Y02P20/582
    • Pyrroles of the formula I ##STR1## are prepared by a process in which a dialkoxytetrahydrofuran of the formula II ##STR2## where R.sup.2 to R.sup.5 in the formulae (I) and (II) are identical or different and are each hydrogen, a straight-chain or branched alkyl or alkenyl radical of not more than 12 carbon atoms, a cycloalkyl or cycloalkenyl radical of 5 to 8 carbon atoms, an aryl, alkylaryl or aralkyl radical of 6 to 16 carbon atoms, and two non-adjacent radicals R.sup.6 to R.sup.9 are alkoxy and the other two radicals R.sup.6 to R.sup.9 are hydrogen, is reacted with ammonia or a primary amine H.sub.2 NR.sup.1, where R.sup.1 in formula (I) is hydrogen, alkyl, aryl, alkylaryl, aralkyl or cycloalkyl, in the presence of an acidic, solid, heterogeneous catalyst. Zeolites, for example those of the pentasil type or faujasite type, or phosphates, acidic oxides, phosphoric acid or boric acid on a carrier can be used as the solid heterogeneous catalysts.
    • 式I(I)的吡咯可以通过其中式II(II)的二烷氧基四氢呋喃与式(I)和(II)中的R 2至R 5相同或不同的方法制备, 每个氢,不超过12个碳原子的直链或支链烷基或烯基,5-8个碳原子的环烷基或环烯基,6-16个碳原子的芳基,烷芳基或芳烷基, 相邻的基团R6至R9为烷氧基,另外两个基团R6至R9为氢,与氨或伯胺H 2 N R 1反应,其中式(I)中的R 1为氢,烷基,芳基,烷基芳基,芳烷基或环烷基, 酸性,固体,非均相催化剂的存在。 作为固体多相催化剂,可以使用沸石,例如pentasil类型或八面沸石型沸石,或载体上的磷酸盐,酸性氧化物,磷酸或硼酸。