Facile Synthesis of Chiral Cyclic Ureas through Hydrogenation of 2-Hydroxypyrimidine/Pyrimidin-2(1<i>H</i>
)-one Tautomers
作者:Guang-Shou Feng、Mu-Wang Chen、Lei Shi、Yong-Gui Zhou
DOI:10.1002/anie.201801485
日期:2018.5.14
A facile access to optically active cyclic ureas was developed through palladium‐catalyzed asymmetric hydrogenation of pyrimidines containing tautomeric hydroxy group with up to 99 % ee. Mechanistic studies indicated that reaction pathway proceed through hydrogenation of C=N of the oxo tautomer pyrimidin‐2(1H)‐one, acid‐catalyzed isomerization of enamine–imine, and hydrogenation of imine pathway. In
通过钯催化不对称氢化的嘧啶类化合物,可以容易地获得旋光性环状脲,其中嘧啶类的互变异构羟基含量高达ee的99%。机理研究表明,反应途径是通过羰基互变异构体嘧啶2(1 H)-1的C = N氢化,烯胺-亚胺的酸催化异构化和亚胺途径的氢化而进行的。此外,手性环状脲很容易转化为有用的手性1,3-二胺和硫脲衍生物,而不会降低光学纯度。