本論文為研究螺環化合物之合成,以不同兩員環數之分子搭配,進而環化成一系列的螺環化合物。其中中間環為六員環的螺環化合物,利用Sonogashira偶合反應等步驟製備出烯醛-烯酮前驅物,並利用氮-雜環碳烯 (N-heterocyclic carbenes)進行分子內Stetter反應成功地建構出參環螺環化合物,而改變不同員環數的烯醛-烯酮化合物作為起始物皆可產生出螺環化合物,產率為54-72%。而中間環為五員環的螺環化合物利用Wittig反應等步驟製備出前驅物,利用氮-雜環碳烯 (N-heterocyclic carbenes)進行分子內Stetter反應成功地建構出參環螺環化合物,產率為31%。 (螺環化合物,氮-雜環碳烯)
In this thesis, we have studied N-heterocyclic carbene-mediated intramolecular Stetter reaction to construct tricyclic spiranes. The cyclic enal-enones were used as substrates in the studied. Treatment of 2-ethyl cyclic enal-enones with NHC has produced tricyclic spiranes in 54-72% yields. As well as, the use of 2-((3-oxocyclohex-1-en-1-yl)methyl)cyclohex-1- enecarbaldehyde as starting material has produced 4',5',6',7'-tetrahydrospiro- [cyclohexane-1,2'-indene]-1',3(3'H)-dione in 31% yield. (tricyclic spiranes,N-heterocyclic carbene)