preparation of 2-hydroxy-5,6,7,7a-tetrahydro-3H-pyrrolizin-3-ones and 2-hydroxy-6,7,8,8a-tetrahydroindolizin-3(5H)-ones from a condensation cyclization of α-oxoesters with five- and six-membered cyclic imines, respectively, is reported. This transformation enables a concise, three-step synthesis of the natural products phenopyrrozin and p-hydroxyphenopyrrozin. Further, biologically relevant scaffolds
2-羟基-5,6,7,7a-四氢-3 H-
吡咯烷酮-3-酮和2-羟基-6,7,8,8a-四氢
吲哚-3(5 H)的克级制备方法。据报道,α-氧代酸酯分别与五元和六元环状
亚胺的缩合环化反应得到的α-酮。该转化使得
天然产物苯并
吡嗪和对羟基苯并
吡嗪的简明的三步合成成为可能。此外,
生物相关的支架,如α-β季-HOMO脯
氨酸和β内酰胺类,也在两准备从三步骤多功能-2-羟基-5,6,7,7a-四氢3 ħ -
吡咯烷-3-一核。