名称:
A facile synthetic method for 2-fluoroindolizines from 1-chloro-2,2,2-trifluoroethane (HCFC-133a) and 1,1,1,2-tetrafluoroethane (HFC-134a)
摘要:
In the presence of KOH and Et3N. pyridinium and isoquinolinium N-ylides generated in situ from their bromides react with 1-chloro-2,2,2-trifluoroethane (HCFC-133a. bp 6 degreesC) or 1,1,1,2-tetrafluoroethane (HFC-134a, bp -27 degreesC) to give the corresponding 2-fluoroindolizines via 1,3-dipolar [3 divided by 2] cycloaddition at 80-100 degreesC in DMSO at atmospheric pressure in normal glassware. (C) 2003 Elsevier Science B.V. All rights reserved.