A convenient synthesis of polyfluoroalkyl-substituted pyrazolo[1,5-a] pyridine, pyrrolo[1,2-b]pyridazine and indolizine derivatives
作者:Xue-chun Zhang、Wei-yuan Huang
DOI:10.1016/s0022-1139(97)00118-8
日期:1998.1
(1b) or N-amino-isoquinolinium iodide (1c), N-phenacylpyridazinium (4), N-phenacylpyridinium (6a–c), and N-phenacylisoquinolinium (6d) bromides in DMF to give poly(per)fluoroalkyl-substituted pyrazolo[1,5-a] pyridine (3), pyrrolo[l,2-a]pyridazine (5) and indolizine (7 and 8) derivatives, respectively.
2H,2H-Perfluoroalkylethanoïc acids and their derivatives compounds are potentially useful intermediates. The reaction of these with primary or secondary amines gives easy access to several perfluoroalkylated products such as imines, enamines, enaminoesters and enaminoamides in good yield and high stereoselectivity.
A new approach to pyrrolo[1,2-a]quinoxaline derivatives
作者:Xue-chun Zhang、Wei-yuan Huang
DOI:10.1016/s0040-4039(97)01021-6
日期:1997.7
2-dihydropoly(per)fluoroalkanoate(2) reacted with N-phenacyl benzimidazole bromide(1a–1b),N-acetonyl benzimidazole bromide(1c) and N-ethoxycarbonylmethyl benzimidazole bromide(1d) in DMF to give pyrrolo[1,2-a]quinoxaline derivatives(3ae-3dg) respectively.
Cycloaddition reactions of N-(cyanomethyl)pyridinium ylides with 2,2-dihydropolyfluoroalkanoates
作者:Xue-chun Zhang、Wei-yuan Huang
DOI:10.1016/s0022-1139(98)00241-3
日期:1998.10
In the presence of base, 2,2-dihydropolyfluoroalkanoates of type RFCF2CH2CO2Et (2) react with N-(cyanomethyl)pyridinium and N-(cyanomethyl)-isoquinolinium ylides (1) to give the corresponding indolizine derivatives carrying both a fluoroalkyl and a cyano group (3).
在碱的存在下,类型为R F CF 2 CH 2 CO 2 Et(2)的2,2-二氢聚氟链烷酸酯与N-(氰基甲基)吡啶鎓和N-(氰基甲基)-异喹啉鎓碘化物(1)反应,得到相应的吲哚嗪带有氟烷基和氰基的衍生物(3)。
Reaction of 1-alkylbenzimidazolium 3-ylides with ethyl 2,2-dihydropolyfluoroalkanoates
作者:Xue-chun Zhang、Wei-yuan Huang
DOI:10.1016/s0040-4020(98)00728-5
日期:1998.10
In the presence of base, ethyl 2,2-dihydropolyfluoroalkanoates(2) reacted with N-phenacyl(1a-1b), N-acetonyl(1c), N-ethoxycarbonylmethyl(1d) and N-(diethylaminocarbonyl-methyl) benzimidazole bromides(le) in DMF to give the corresponding pyrrolo[1,2-a]quinoxaline derivatives (3) respectively. When (2) was reacted with N-cyanomethyl benzimidazole bromides (1f-1g), fluoroalkyl substituted I-aryl pyrrole derivatives (4) were formed as the major products. (C) 1998 Elsevier Science Ltd. All rights reserved.