在非均相催化剂体系的存在下,在空气中以高收率和良好至优异的对映选择性(高达97%ee)还原了多种手性酮,该催化剂体系是由催化量的超顺磁性CuFe 2 O 4原位形成的介孔二氧化硅KIT-6和非外消旋二吡啶基膦配体,化学计量的氢化物供体聚甲基氢硅氧烷(PMHS)以及一定量的添加剂负载的纳米颗粒。磁性可分离的催化剂可以有效地重复使用4次,而活性和对映选择性均无明显损失。
Deaminative Addition of Alkylpyridinium Salt to Aldehyde
作者:Yu Huang、Zhengqiang Liu、Wenbo H. Liu
DOI:10.1021/acs.orglett.3c01724
日期:2023.7.7
Here we show that a primary amine can engage in the nucleophilic addition to an aldehyde to synthesize an alcohol following preactivation of the amine. The enabling reagent for this radical-polar crossover process is CrCl2. This reaction is selective for aldehydes and compatible with numerous functional groups, which are not tolerated under classical Grignard-type conditions. Complementary to the well-established