Threonine-derived thioureas as bifunctional organocatalysts for enantioselective Michael addition
作者:Zhi Zheng、Jian Lin、Yang Sun、Suoqin Zhang
DOI:10.1016/j.tetlet.2019.151382
日期:2020.1
A series of threonine-derived thioureas were developed through the facile modification of L-threonine chiral scaffold. The enantioselective efficiency were evaluated in the catalytic asymmetric Michael addition of 2-hydroxy-1,4-naphthoquinone to nitroalkenes, which afforded the chiral nitroalkylated naphthoquinone derivatives in high yields (up to 93%) and enantio-selectivities (up to 99% ee) under
通过对L-苏氨酸手性骨架的轻松修饰,开发了一系列苏氨酸衍生的硫脲。通过将2-羟基-1,4-萘醌催化不对称迈克尔加成到硝基烯烃中来评估对映选择性效率,从而以高收率(高达93%)和对映选择性(高达99%ee)提供手性硝基烷基化萘醌衍生物。)在低催化剂负载量(3 mol%)下进行。