A Diels–Alder reaction leading to 4-nitrophenylcyclohexanones followed by a newly developed base-mediated reductive cyclization of the resulting ketone tethered to the nitrobenzene moiety gives access to the hexahydro-2,6-methano-1-benzazocine ring system present in several biologically interesting natural products such as aspernomine. The scope of the reaction was explored with eight substituted nitrobenzenes
导致 4-
硝基苯基
环己酮的 Diels-Alder 反应,然后是新开发的碱介导的还原环化所产生的与
硝基苯部分相连的酮,从而获得存在于多种
生物中的六氢-2,6-
甲烷-1-苯并佐辛环系统有趣的天然产品,例如
亚精胺。用八种取代的
硝基苯探索了反应的范围,获得了高达 87% 的收率。在带有烯酮部分的苯扎佐辛4h中观察到最高的细胞毒性,它对八种癌
细胞系具有活性。