反应详情

4-(2,6-difluorophenyl)-1H-1,2,3-triazole-5-carbonitrile (2) was prepared in one step from 2,6-difluorobenzaldehyde (1) and nitroacetonitrile using a modified literature procedure (see Fringuelli et al. Eur. J. Org. Chem. (2008) 3928-3932). A solution of 2,6-difluorobenzaldehyde (1.0 equiv), nitroacetonitrile (1.5 equiv) and TMS-azide (3.0 equiv) in dry THF (0.4 M) under inert atmosphere and at 0° C. was treated with fluoride-bound resin (Aldrich #387789, 1:1 w/w with respect to aldehyde). The resulting mixture was heated to reflux for 2 h (reaction completed according to TLC), cooled to room temperature and concentrated in vacuo to provide (2) as an orange solid which was used directly in the next reaction.

1. temperatureThe resulting mixture was heated
2. temperatureto reflux for 2 h
3. custom(reaction completed according to TLC)
4. concentrationconcentrated in vacuo