An efficient 5-exo-dig cyclization was observed when TMS-protected alkynyl-quinolines bearing a carbonyl group were submitted to a mixture of an alcohol (alkyl-OH, diol, amino alcohol) with an inorganic base (K2CO3). The cyclization process seems to go through the deprotection of the TMS group prior to the cyclization step. The dihydrofuroquinoline derivatives formed are structurally related to the well-known furoquinoline alkaloids family. The scope and limitations of this reaction have also been studied with diverse bases and various alkynyl and carbonyl derivatives.
                                    当含有酮基的TMS保护炔基
喹啉与醇(烷基醇、二醇、
氨基醇)和
无机碱(K2CO3)混合时,观察到一种高效的5-exo-dig环化反应。环化过程似乎通过TMS基团的去保护步骤,然后再进行环化。所形成的二氢
呋喃喹啉衍
生物在结构上与著名的
呋喃喹啉生物碱家族有关。该反应的范围和局限性也已通过不同的碱和各种炔基及羰基衍
生物进行了研究。