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.
Synthesis of 2-Substituted 6-Fluoroalkylpyrimidin-4(3H)-ones and -pyrimidines
作者:Hui-Ping Guan、Qiao-Sheng Hu、Chang-Ming Hu
DOI:10.1055/s-1996-4327
日期:1996.8
Treatment of ethyl α-fluoroalkylacetates 1 or ethyl 3-fluoroalkyl-2-iodoacrylates 2 under mild conditions with amidine affords 2-substituted 6-fluoroalkylpyrimidin-4(3H)-ones 4, 5, 6, 7 in excellent yields, while α-fluoroalkyl alkyl ketones or α-fluoroalkyl aldehyde 3 give polysubstituted 6-fluoroalkylpyrimidines 8, 9 under the same conditions.
An Effective Synthesis of 2-Trifluoromethyl- or 2-(1,1-Difluoroalkyl)thiophenes
作者:Hui-Ping Guan、Bing-Hao Luo、Chang-Ming Hu
DOI:10.1055/s-1997-1204
日期:1997.4
Various thiophenecarboxylates carrying a 2-trifluoromethyl, 2-(1,1-difluoroalkyl) or 2-polyfluoroalkyl group are synthesized conveniently from reaction of α-fluoroalkyl ketones 1, aldehydes 2 or ethyl α-fluoroalkylacetates 3 with methyl (or ethyl) 2-sulfanylacetates 4. A possible reaction pathway is suggested.
Tandem Reaction of Ethyl α-(Per(poly)fluoroalkyl)acetates with Allylic Alcohols: A Convenient Synthesis of Ethyl α-(2-Alkenyl)-α-(per(poly)- fluoroacyl)acetates
作者:Bing-Hao Luo、Hui-Ping Guan、Chang-Ming Hu
DOI:10.1021/jo9620369
日期:1997.6.13
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.