Synthesis of pyrido[2,3-<i>d</i>]pyrimidines in the reaction of 6-amino-2,3-dihydro-2-thioxo-4(1<i>H</i>)-pyrimidinone with chalcones
作者:Jairo Quiroga、Braulio Insuasty、Adolfo Sanchez、Manuel Nogueras、Herbert Meier
DOI:10.1002/jhet.5570290502
日期:1992.8
6-Amino-2,3-dihydro-2-thioxo-4(1H)-pyrimidinone (1) reacts in boiling DMF with α,/β-unsaturated ketones 2 yielding the pyrido[2,3-d]pyrimidine systems 5 and 6, respectively. The orientation in the addition process can be determined by nmr measurements, especially by NOE difference spectroscopy. The products do not correspond to a normal Skraup or Doebner-v. Miller synthesis.
6-氨基-2,3-二氢-2-硫代氧杂4(1 H)-嘧啶酮(1)在沸腾的DMF中与α,/β-不饱和酮2反应,生成吡啶并[2,3- d ]嘧啶体系5和6。加成过程中的取向可以通过核磁共振测量来确定,尤其是可以通过NOE差光谱法来确定。产品与正常的Skraup或Doebner-v不符。米勒合成。