manipulated to various other chiral biphenyls. Another series of chiral biphenyls were obtained via an asymmetric Ullmann reaction, which was shown to be thermodynamically controlled. The de's of this copper mediated process were also in the range of 90% and could be utilized to reach various derivatives. Racemization, thermal stability, and atropisomerization characteristics were also studied.
通过涉及手性
恶唑啉的不对称反应制备了一系列手性
联苯。
镁介导的芳基
溴化物(通过其
格氏试剂)与邻甲氧基芳基
恶唑啉的偶联,可以得到一系列的手性
联苯。在这种情况下,只有Ø-甲氧基被ArMgBr取代。最初形成的
联苯加合物的得斯高达92:8。这些加合物可以被加工成各种其他手性
联苯。通过不对称的乌尔曼反应获得了另一系列的手性
联苯,该反应显示为热力学控制的。
铜介导的过程的de也在90%的范围内,可用于获得各种衍
生物。还研究了外消旋,热稳定性和阻转异构化特征。