Phosphine-Catalyzed α-Umpolung–Aldol Reaction for the Synthesis of Benzo[<i>b</i>]azapin-3-ones
作者:Kui Zhang、Lingchao Cai、Sooji Hong、Ohyun Kwon
DOI:10.1021/acs.orglett.9b01749
日期:2019.7.5
serves as a conduit for the construction of benzo[b]azepin-3-ones in good to excellent yields under mild conditions. The resulting 2-benzylidene moieties are formed exclusively in the E-configuration. Mechanistically, this unusual annulation occurs through a phosphine-catalyzed α-umpolung addition, followed by an aldol reaction. One of the benzo[b]azepin-3-one products was converted to the core structure
报道了一种新型膦催化的 2-磺酰胺苯甲醛和炔酮之间的分子间环化。该方法可作为在温和条件下以良好至优异的产率构建苯并[ b ]氮杂-3-酮的渠道。所得的2-亚苄基部分仅以E-构型形成。从机制上讲,这种不寻常的环化是通过膦催化的 α-umpolung 加成,然后是羟醛反应发生的。其中一种苯并[ b ]氮杂卓-3-酮产品被转化为3-氨基-[ a ]苯并氮杂卓-2-一-1-链烷酸的核心结构,其中许多充当血管紧张素转换酶抑制剂。