Use of the Pictet–Spengler reaction for the synthesis of 1,4-disubstituted-1,2,3,4-tetrahydro-β-carbolines and 1,4-disubstituted-β-carbolines: formation of γ-carbolines
作者:Radhika S. Kusurkar、Nabil A.H. Alkobati、Anita S. Gokule、Vedavati G. Puranik
DOI:10.1016/j.tet.2007.12.008
日期:2008.2
Microwave-assisted conjugate addition of indole on nitro-olefins furnished nitro compounds, which were reduced to tryptamines. Further, by using Pictet–Spengler condensation, new 1,4-disubstituted-1,2,3,4-tetrahydro-β-carbolines were synthesized in diastereoselective manner. Dehydrogenation of the tetrahydro-β-carbolines produced new 1,4-disubstituted-β-carbolines. As a new observation, in some of
在硝基烯烃上进行微波辅助的吲哚共轭加成,得到的硝基化合物被还原为色胺。此外,通过使用Pictet-Spengler缩合,以非对映选择性的方式合成了新的1,4-二取代-1,2,3,4-四氢-β-咔啉。四氢-β-咔啉的脱氢产生了新的1,4-二取代-β-咔啉。作为新的观察,在某些情况下,Pictet-Spengler缩合和脱氢反应生成两种产物,即1,4-二取代-β-咔啉和1,4-二取代-γ-咔啉。为此,提出了一种机制。