Di- and triazidation of 3-chlorotetrafluoropyridine
摘要:
3-Chlorotetrafluoropyridine and pentafluoropyridine readily react with an excess of sodium azide in dimethylsulfoxide at room temperature to give corresponding 2.4,6-triazido-3-chloro-5-fluoropyridine and 2,4,6-triazido-3,5-difluoropyridine in high yields. The reaction of asymmetric 3-chlorotetrafluorpyridine with two equimolar amounts of sodium azide under similar reaction conditions occurs regioselectively to give 2,4-diazido-5-chloro-3,6-difluoropyridine as a sole product. (19)F, (13)C and (15)N NMR spectral characteristics of the triazides suggest that these compounds can be of interest as cross-linking reagents for polymer chemistry and as starting materials for organic synthesis. (C) 2011 Elsevier B.V. All rights reserved.