A General, Diastereoselective Synthesis of Highly Functionalized Bicyclo[n.3.1]alkane Systems Based on an Anionic Domino Reaction of α-Nitrocycloalkanones
作者:Giorgio Giorgi、Sonia Miranda、Miriam Ruiz、Jean Rodriguez、Pilar López-Alvarado、J. Carlos Menéndez
DOI:10.1002/ejoc.201001672
日期:2011.4
base-promoted Michael–aldol anionic domino reactions of cyclic α-nitro ketones and α,β-unsaturated aldehydes afforded bicyclo[n.3.1]alkanone systems of seven different ring sizes (n = 3–9), normally in excellent yields. This can be considered the first general method for the synthesis of this type of carbocycle. Furthermore, up to four stereocentres are generated, three of which are contiguous and include a functionalized
环状α-硝基酮和α,β-不饱和醛的碱促进迈克尔-羟醛阴离子多米诺反应提供了七种不同环大小(n = 3-9)的双环[n.3.1]烷酮系统,通常产率极好。这可以被认为是合成此类碳环的第一种通用方法。此外,生成多达四个立体中心,其中三个是连续的,并包括一个功能化的季桥头碳原子。非对映选择性通常是完全的,比基于相关多米诺过程的不太一般的反应高得多,并且由于硝基对反应的迈克尔和羟醛单独步骤的控制,导致产生不同的主要非对映异构体。