Highly diastereoselective synthesis of trifluoromethyl containing spiro[pyrrolidin-3,2′-oxindoles] from N-2,2,2-trifluoroethylsubstituted isatin imines and β,γ-unsaturated α-keto esters
作者:Ya Xiong、Xiao-Xue Han、Yu Lu、Hui-Juan Wang、Min Zhang、Xiong-Wei Liu
DOI:10.1016/j.tet.2021.132112
日期:2021.5
Inspired by the chemistry and biology of fluorine-containing molecules and pyrrolidinyl spirooxindoles, herein we report a highly diastereoselective [3 + 2] cycloaddition reaction of β,γ-unsaturated α-keto esters and N-2,2,2-trifluoroethylisatin ketimines in the presence of the catalyst DABCO. The process enables efficient incorporation of CF3 groups into pharmaceutically important spiro[pyrrolidin-3
受含氟分子和吡咯烷基螺氧辛酯的化学和生物学影响,本文报道了β,γ-不饱和α-酮酯和N-2,2,2-三氟乙基异丁烯酮酮的非对映选择性[3 + 2]环加成反应。催化剂DABCO的存在。该方法能够将CF 3基团有效地掺入药学上重要的螺[吡咯烷烃3,2'-羟吲哚],并具有四个连续的立体异构中心,包括一个四取代碳,效率高(产率高达93%,非对映异构体> 20:1)比率)。此外,使用β,γ-不饱和α与该烯酮底物(如查尔酮和苯并丙酮)不同的是,在此反应中作为2C结构单元的-酮酸酯进一步扩大了它们的适用范围。