Partially flourinated heterocyclic compounds. Part 19 [1]. The formation of fischer indole products from a series of hydrozones derived from pentaflourophenylhydrazine and 1,3,4,5,6,7,8-heptaflouro-2-naphthylhydrazine. The surprising loss of o-flourine
作者:Frank D. Benke、Gerald M. Brooke
DOI:10.1016/s0022-1139(00)85121-0
日期:1984.9
7-tetrafluoroindole and 4,5,6,7,8,9-hexafluorobenz[e]indole derivatives when heated under reflux in tetralin. These products are typical Fischer indole products — yet the substrates all have fluorine atoms in positions to the nitrogen rather than hydrogen which is a pre-requisite in the conventional reaction. Acetaldehyde (10) and cyclohexanone(11) pentafluorophenylhydrazones give 4,5,6,7-tetrafluoroindole(8) (1.5%)
各种醛和酮的五氟苯基和1,3,4,5,6,7,8-七氟-2-萘hydr酮可得到4,5,6,7-四氟吲哚和4,5,6,7,8,在四氢化萘中加热回流时的9-六氟苯并[e]吲哚衍生物。这些产品是典型的Fischer吲哚产品-但基材均在位置上具有氟原子氮而不是氢,氢是常规反应中的预丙酸。乙醛(10)和环己酮(11)五氟苯基hydr酮生成4,5,6,7-四氟吲哚(8)(1.5%)和5,6,7,8-四氟-1,2,3,4-四氢咔唑(9) (18%)。4-甲基苯乙酮-(12),丙苯酮-(13),1,2-二苯乙酮-(14),丙酮-(15)和苯乙醛-1,3,4,5,6,7,8-七氟-2-萘hydr产生4,5,6,7,8,9-六氟-2-(4-甲基苯基)-(16)(41%),-2-苯基-3-甲基-(17)(34%),- 2,3-二苯基-(18)(42%),-2-甲基-(19)(20%)和-3-苯基-(20)(24%)-苯并[e]吲哚。