Synthesis of Heterocyclic Compounds Containing Perfluoroalkyl Groups. Reactions of Perfluoro(2-methyl-2-pentene) and Perfluoro(5-aza-4-nonene) with N,S-Dinucleophiles
作者:G. G. Furin、E. L. Zhuzhgov
DOI:10.1007/s11178-005-0183-1
日期:2005.3
Perfluoro(2-methyl-2-pentene) and perfluoro(5-aza-4-nonene) react with 1,4,5,6-tetrahydropyrimi-dine-2-thiol, pyridine-2-thiol, and 1,2,4-triazole-3-thiol to afford fused heterocyclic systems, while their reactions with tetrahydrothiazole-2-thione and pyrimidine-2-thiol result in replacement of the fluorine atom at the double bond. Treatment of 3,3,3-trifluoro-1-pentafluoroethyl-2-trifluoromethyl-1-pentenyl isothiocyanate with ammonia gives N-(3,3,3-trifluoro-1-pentafluoroethyl-2-trifluoromethyl-1-propenyl)thiourea which undergoes ring closure to 4-tetrafluoroethylidene-5,5-bis(trifluoromethyl)-4,5-dihydrothiazol-2-amine. Possible cyclization paths and the effect of the 1,3(N,S)-dinucleophile nature on the direction of nucleophilic addition at the double bond are discussed.
全氟(2-甲基-2-戊烯)和全氟(5-氮-4-壬烯)与1,4,5,6-四氢嘧啶-2-硫醇、吡啶-2-硫醇和1,2,4-三唑-3-硫醇反应,生成融合的杂环系统,而它们与四氢噻唑-2-硫酮和嘧啶-2-硫醇的反应则导致双键处氟原子的取代。将3,3,3-三氟-1-五氟乙基-2-三氟甲基-1-烯基异硫氰酸酯与氨反应可得到N-(3,3,3-三氟-1-五氟乙基-2-三氟甲基-1-丙烯基)硫脲,该化合物经过环化形成4-四氟乙烯基-5,5-双(三氟甲基)-4,5-二氢噻唑-2-胺。讨论了可能的环化路径及1,3(N,S)-二亲核试剂的性质对双键处亲核加成方向的影响。