Catalytic asymmetric addition of arylboronic acids to N-Boc imines generated in situ using C2-symmetric cationic N-heterocyclic carbenes (NHCs) Pd2+ diaquo complexes
作者:Zhen Liu、Min Shi
DOI:10.1016/j.tet.2010.02.037
日期:2010.4
The catalytic asymmetric addition of arylboronic acids to N-Boc imines generated in situ from stable and easily prepared α-carbamoyl sulfones was realized by using chiral cationic C2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaquo complexes 1a–c as the catalysts, producing the corresponding adducts in good to high yields (up to 89%) and good to high enantioselectivities (up to 90% ee).
通过使用手性阳离子C 2对称N-杂环碳烯(NHC)Pd 2+合物1a – c作为基体,可以将芳基硼酸催化不对称加成到稳定稳定地制备的稳定的α-氨基甲酰基砜生成的N -Boc亚胺中。催化剂,以高到高的收率(最高89%)和高到高的对映选择性(最高90%ee)生产相应的加合物。