Oxotryptamines were firstly used as flexible four-atom synthons in an NHC-catalyzed formal [4+3] annulation, providing a novel enantioselective method to access structurally diverse spiro-ϵ-lactam oxindoles with excellent enantioselectivities. This metal-free reaction features a broad substrate scope, excellent functional-group tolerance and proceeds under mild reaction conditions. Importantly, enantiopure
Oxotryptptamines首先在NHC催化的正式[4 + 3]环空中用作柔性的四原子合成子,提供了一种新的对映选择性方法,可利用具有优异对映选择性的结构多样的螺-内酰胺基
吲哚。这种无
金属的反应具有广泛的底物范围,出色的官能团耐受性,并且可以在温和的反应条件下进行。重要的是,对映体纯的特权六氢
吡咯并
吲哚可以很容易地通过一锅法从所得的螺-β-内酰胺基
吲哚制备。