Rearrangement of 2-(haloalkoxy)pyridines to N-haloalkyl-2(1H)-pyridones
摘要:
2-(Haloalkoxy)pyridines thermally rearrange to N-haloalkyl-2(1H)-pyridones in high Yield. The reaction rate is accelerated by use of a more polar solvent, by bromine rather than chlorine as the halogen substituent and by a two-carbon alkoxy chain as opposed to a three or, especially, four-carbon chain. The reaction kinetics can be interpreted in terms of an oxazolium ion intermediate.