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。