Partially fluorinated heterocyclic compounds. Part 14. Syntheses of 4,5,6,7-tetrafluoro-2,3-dihydro-2-methyl-1-benzothiophen and 5,6,7,8-tetrafluorothiochroman from pentafluorophenyl prop-2-enyl sulphide via the Claisen rearrangement intermediate and the related reaction of prop-2-enyl 2,3,5,6-tetrafluorophenyl sulphide. Reactions which appear to proceed via homolytic fission of an aliphatic carbon–fluorine bond
作者:Gerald M. Brooke、Derek I. Wallis
DOI:10.1039/p19810001659
日期:——
pentafluorophenyl sulphide (9), and perfluoropoly(phenylene sulphide). Prop-2-enyl 2,3,5,6-tetrafluorophenyl sulphide (2) reacted similarly to give 4,6,7-trifluoro-2,3-dihydro-2-methyl-1-benzothiophen (6), 5,7,8-trifluorothiochroman (7), ethyl 2,3,5,6-tetrafluorophenyl sulphide (8), and N-ethylaniline. Homolytic fission of the aliphatic C–F bond in the respective Claisen rearrangement intermediates from (3) and
丙-2-烯基2,3,4,5-四氟苯硫醚(1)在NN-二乙基苯胺中进行克莱森重排,得到4,5,6,7-四氟-2,3-二氢-2-甲基-1-苯并噻吩(4)和5,6,7,8-四氟噻喃(5)。五氟苯基丙-2-烯基硫醚(3)在NN二乙基苯胺也得到(4)和(5)伴随丙-2-烯基-3,4,5,6-四氟-2-(丙-2-烯基)苯基硫化物(10),乙基五氟苯硫醚(9)和全氟聚(苯硫醚)。丙-2-烯基2,3,5,6-四氟苯硫醚(2)反应相似,得到4,6,7-三氟-2,3-二氢-2-甲基-1-苯并噻吩(6),5,7 ,8-三氟硫代苯并二氢吡喃(7),乙基2,3,5,6-四氟苯硫醚(8)和N-乙基苯胺。提出在(3)和(2)的各个克莱森重排中间体中脂族CF键的均相裂变可解释(4),(5)和(10)以及(6)和(6)的形成。 (7)。化合物(8)–(10)是通过其他方法合成的。