本文主要探討三個主題,依序利用路易斯酸輔佐分子內環化芳香1,5-烯炔醯胺、五員環N-丙炔基-N-1-炔醯胺,和呋喃炔醯胺化合物,分別合成出2-胺基萘、螺旋γ-內醯胺,與三取代吡咯衍生物。 (1) 利用三氟甲磺酸銦催化劑,可有效的使鄰位帶有烯烴的芳香N-甲基-N-甲苯磺醯基炔醯胺化合物,合成出2-胺基萘衍生物。高效率的合成、溫和的反應條件,以及符合原子經濟效應皆為此反應的優勢。此外,也可利用sodium naphtalenide於四氫呋喃溶液中,成功將氮上的甲苯磺醯基去保護,得到二級胺萘衍生物。 (2) 以二氯亞鐵試劑輔佐五員環N-丙炔基-N-1-炔醯胺化合物,於四氫呋喃溶劑且乾燥空氣的條件下,進行分子內環化可生成氯加成的螺旋γ-內醯胺衍生物。二氯亞鐵活化N-丙炔基-N-1-炔醯胺,會先形成keteniminium ion中間體(I),氯陰離子加成至keteniminium ion碳中心得到中間體(II),另一個氯陰離子由同側加成至炔基,水解後可得螺旋γ-內醯胺衍生物。 (3) 利用金(III)催化呋喃炔醯胺化合物可有效合成2,3,4-三取代吡咯衍生物。以5 mol%氯金酸鈉作為反應催化劑,於溫和的條件下進行環化反應,即可得到高產率吡咯環化產物。其中值得一提的是,呋喃-炔醯胺化合物經金(III)催化,可促使呋喃開環來進行環化反應。而吡咯衍生物3號位帶有共軛烯醛取代,可藉由反應溫度的不同,個別分離出(Z)-或(E)-組態產物。
This thesis covers three topics. Lewis acid-promoted intramolecular cyclization reactions of aromatic 1,5-enynamides, five-membered ring N-propargyl-N-1-ynylamides, and furan-tetherted ynamides yielding 2-aminonaphthalenes, spiro γ-lactams, and trisubstituted pyrrole derivatives, respectivety. (1) Indium triflate enabled the efficient synthesis of 2-aminonaphthalenes from aromatic N-methyl-N-tosyl-ynamides bearing an ortho-vinyl group. The reaction featured high efficiency, mild reaction conditions, as well as atom economy. Furthermore, the deprotection of the N-tosyl group with sodium naphtalenide in tetrahydrofuran provided the corresponding free amino napathalene derivatives. (2) The FeClR2R-promoted intramolecular cyclization of five-membered ring N-propargyl-N-1-ynylamides in tetrahydrofuran under dry air afforded chlorinated spiro γ-lactams. Activation of the N-propargyl-N-1-ynylamides with FeClR2R gave the keteniminium ion (I), which was attacked by chloride anion to afforded intermediate (II). Syn-addition of the chloride and the olefin moiety to the pendant alkyne of II generated the spiro γ-lactams. (3) An efficient gold(III)-catalyzed formation of 2,3,4-trisubstituted pyrrole derivatives from furan-tethered ynamides is reported. The transformation was under mild reaction conditions and in good yield using 5 mol% NaAuClR4R as the catalyst. It worthly noted that gold(III)-catalyzed furan-ynamide cyclization proceeded through ring-opening of furan. And the pyrrole deivatives had a propenal side chain at C3 position, the isolation of (Z)- or (E)- configuration were both viable by different reaction temperature.