Direct Access to Highly Functionalized Heterocycles through the Condensation of Cyclic Imines and α-Oxoesters
作者:Alexander Q. Cusumano、Matthew W. Boudreau、Joshua G. Pierce
DOI:10.1021/acs.joc.7b02572
日期:2017.12.15
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。