Efficient Synthesis of 2,3,4,5-Tetrahydro-1<i>H</i>-3-benzazepines by Intramolecular Heck Reaction
作者:Lutz F. Tietze、Ralph Schimpf
DOI:10.1055/s-1993-25961
日期:——
A new facile method for the synthesis of the pharmacologically interesting 3-benzazepine skeleton is described. The easily available iodinated benzene derivative 3 is alkylated with allyl halides 4a-c to afford compounds 5a-c. Pd-catalyzed Heck-type cyclization leads to 3-benzazepines 6, 7, and 8 in 75-92 % yield, with 7 and 8 being mixtures of isomers. Hydrogenation gives uniform 1-alkyl substituted compounds 9a-c, of which 9c is transformed into the derivatives 10, 11, and 12.
描述了一种合成药理学上有趣的3-苯并氮杂环骨架的新方法。常见的碘化苯衍生物3与烯丙基卤化物4a-c发生烷基化反应,得到了化合物5a-c。经过Pd催化的Heck类型环化反应,得到3-苯并氮杂环6、7和8,产率为75-92%,其中7和8是异构体的混合物。氢化反应得到均匀的1-烷基取代化合物9a-c,其中9c进一步转化为衍生物10、11和12。