已经开发出一种高效的NaBAr F 4催化氧化环化反应,该反应可轻松获得1,5和1,6二炔。重要的是,这种无过渡金属的氧化催化是通过一种可能的路易斯酸催化的S N 2'途径进行的,这与相关的氧化铑和金的催化作用不同。这种方法可以轻松实用地构建各种合成有用的γ-和δ-内酰胺,且收率范围从大到优,而且底物范围广。
Generation of Rhodium(I) Carbenes from Ynamides and Their Reactions with Alkynes and Alkenes
摘要:
Rh(I) carbenes were conveniently generated from readily available ynamides. These metal carbene intermediates could undergo metathesis with electron-rich or neutral alkynes to afford 2-oxopyrrolidines or be trapped by tethered alkenes to yield 3-azabicyclo[3.1.0]-hexanes, a common skeleton in numerous bioactive pharmaceuticals. Although the scope of the former is limited, the latter reaction tolerates various substituted alkenes.