A Novel Approach to the Synthesis of 6-Substituted Uracils in Three-Step, One-Pot Reactions
作者:Javier I. Bardagí、Roberto A. Rossi
DOI:10.1021/jo800358v
日期:2008.6.1
yield. By hydrolysis of 9, 6-(1-naphthyl)uracil was obtained in 98% of isolated yield. When the three steps (SRN1 reaction−cross coupling reaction−hydrolysis) were performed in a one-pot reaction, 6-substituted uracils (1-naphthyl, 4-chlorophenyl, 3-chlorophenyl, 2,3,4,5,6-pentafluorophenyl) were obtained (43−57%) of isolated pure products. When the electrophile was a benzoyl chloride, 6-benzoyl uracil
来自商用6-氯-2,4-二甲氧基(1),并通过与我一个光激励反应3的Sn -离子,2,4-二甲氧基- 6-(三甲基锡烷基)嘧啶(2在95%的收率获得)。通过2与Pd催化的亲电子体1-碘代萘的交叉偶联反应(Stille反应),以76%的收率得到2,4-二甲氧基-6-(萘-1-基)嘧啶(9)。通过水解9,以98%的分离产率获得6-(1-萘基)尿嘧啶。当三个步骤(S RN在一个反应釜中进行1个反应-交叉偶联反应-水解),得到6个取代的尿嘧啶(1-萘基,4-氯苯基,3-氯苯基,2,3,4,5,6-五氟苯基)( 43-57%)的纯净产品。当亲电子试剂为苯甲酰氯时,在分离的纯产物中获得6-苯甲酰基尿嘧啶(54%)和6-(2-氯苯甲酰基)尿嘧啶(49%)。