Synthesis of Pyrazolo[1,5-α]pyrimidinone Regioisomers
作者:Lori K. Gavrin、Arthur Lee、Brian A. Provencher、Walter W. Massefski、Stephen D. Huhn、Gregory M. Ciszewski、Derek C. Cole、John C. McKew
DOI:10.1021/jo062120g
日期:2007.2.1
work describes two distinct routes to prepare pyrazolo[1,5-α]pyrimidin-7-ones and two distinct routes to prepare pyrazolo[1,5-α]pyrimidin-5-ones. Use of 1,3-dimethyluracil as the electrophile in the preparation of the pyrimidin-5-one regioisomer represents a correction of previously reported results. Also, a novel reaction to prepare this isomer was identified and the reaction mechanism elucidated. This