Efficient kinetic resolution of racemic 3-nitro-2H-chromene derivatives catalyzed by Takemoto's organocatalyst
作者:Jian-Wu Xie、Li-Ping Fan、Hong Su、Xin-Sheng Li、Dong-Cheng Xu
DOI:10.1039/b922668k
日期:——
Efficient kinetic resolution of racemic 3-nitro-2H-chromenes by bifunctional thiourea afforded optically active (R)-3-nitro-2H-chromene derivatives with moderate to good enantioselectivities, which simultaneously gave the multifunctional 3,4-diphenyl-3a-nitrobenzopyrano-[3,4-c]-pyrrolidine-1,1-dicarboxylate derivatives with four vicinal chiral carbon centers.
通过双官能硫脲对外消旋 3-硝基-2H-苯进行高效动力学解析,得到了具有光学活性的(R)-3-硝基-2H-苯衍生物,其对映体选择性为中等至良好,同时还得到了具有四个手性碳中心的多功能 3,4-二苯基-3a-硝基苯并吡喃-[3,4-c]-吡咯烷-1,1-二甲酸酯衍生物。