The first catalytic asymmetric α-arylation of pyrazol-5-ones has been established by using 2-indolylmethanols as direct electrophilic arylation reagents under the cooperative catalysis of Pd(0) and a chiral phosphoric acid, which afforded the α-arylation products of pyrazol-5-ones in generally high yields and good enantioselectivities (up to 99% yield, >99% ee).
在Pd(0)和手性
磷酸的协同催化下,以2-
吲哚甲醇为直接亲电芳基化试剂,建立了
吡唑5-酮的第一个催化不对称α-芳基化反应,提供了
吡唑的α-芳基化产物。 -5-酮通常具有高收率和良好的对映选择性(高达99%的收率,> 99%ee)。