作者:Alan R. Katritzky、Sandeep K. Singh、Hai-Ying He
DOI:10.1021/jo010927x
日期:2002.5.1
3-propanediamine or 2-aminobenzylamine with benzotriazole and formaldehyde, respectively. Intermediate 1 reacted with alkyl and aryl Grignard reagents to produce N,N'-unsymmetrically substituted hexahydropyrimidines 2a,b in 90 and 92% yields, respectively. Nucleophilic substitutions of 3 with Grignard reagents, allylsilane, and triethyl phosphite gave N,N'-disubstituted 1,2,3,4-tetrahydroquinazolines 4a-f
通过以下反应可容易地制备1-苯并三唑基甲基-3-丙基六氢嘧啶(1)和1,3-双(1H-1,2,3-苯并三唑-1-基甲基)-1,2,3,4-四氢喹唑啉(3) N-丙基-1,3-丙二胺或2-氨基苄胺分别与苯并三唑和甲醛。中间体1与烷基和芳基格氏试剂反应,分别以90%和92%的产率生产N,N'-不对称取代的六氢嘧啶2a,b。用格氏试剂,烯丙基硅烷和亚磷酸三乙酯进行3的亲核取代,得到N,N'-二取代的1,2,3,4-四氢喹唑啉4a-f,5和6,收率很好。一锅反应中用两种不同的格氏试剂连续处理3,导致区域特异性地形成N,N'-不对称取代的四氢喹唑啉衍生物8a,b。