Sequential <i>N</i>-Acylamide Methylenation−Enamide Ring-Closing Metathesis: Construction of Benzo-Fused Nitrogen Heterocycles
作者:M. Lluïsa Bennasar、Tomàs Roca、Manuel Monerris、Davinia García-Díaz
DOI:10.1021/jo061180j
日期:2006.9.1
catalyst give access to indoles, 1,4-dihydroquinolines, and 1,2-dihydroisoquinolines, respectively. This sequential protocol also allows the synthesis of dihydrobenzoazepines, although the ring-closing metathesis (RCM) step is complicated by the alkene isomerization processes. From certain substrates, the direct annulation is observed in the titanium-mediated step, which is likely to occur through an
衍生自邻-乙烯基苯胺,邻-烯丙基苯胺和邻-乙烯基苄胺的N-酰基酰胺的二甲基噻吩并茂甲基化反应提供了相应的酰胺,这些酰胺暴露于第二代Grubbs钌催化剂后可生成吲哚,1,4-二氢喹啉和1, 2-二氢异喹啉分别。尽管该闭环复分解(RCM)步骤因烯烃异构化过程而变得复杂,但该顺序方案还允许合成二氢苯并a庚因。从某些基材上,可以在钛介导的步骤中观察到直接环化,这很可能是通过烯烃复分解-分子内烯化序列发生的。