Chiral Cu(<scp>ii</scp>)-amino alcohol based complexes for asymmetric aza-Henry reaction of N-Ts imines
作者:Manoj K. Choudhary、Anjan Das、Rukhsana I. Kureshy、Manish Kumar、Noor-ul H. Khan、Sayed H. R. Abdi、Hari C. Bajaj
DOI:10.1039/c3cy00774j
日期:——
3A–B–, 4A–Cu(II)/Cu(I) of dimeric chiral ligands with different copper salts were used as catalysts for the asymmetric aza-Henry reaction of a variety of N-tosylimines as substrates with different nitroalkanes at RT to afford good yields of aza-Henry products (80% with respect to the imines) with excellent enantioselectivity (ee > 99%) in 24 h with nitromethane and high syn selective products with excellent
一系列手性二聚配体的图1A-C ,2A-B ,图3A-B和4A由(衍生小号)/([R)1,1'-二(2-萘酚) -双-醛/哌嗪二醛和各种氨基醇即,(1。- [R,2小号) - ( - ) - 2- aminodiphenylethanol,(1小号,2 - [R )- ( - ) - 2- aminodiphenylethanol,(1 - [R,2小号)-1-氨基-2-合成了,3-二氢-1 H-茚-2-醇和(R)-缬氨醇。原位生成的复合物1A–C –,2A–B –,3A–B–,4A –具有不同铜盐的二聚手性配体的Cu(II)/ Cu(I)被用作催化剂,用于各种N-甲苯胺的不对称aza-Henry反应,在室温下具有不同硝基烷的底物具有良好的收率在24小时内与硝基甲烷形成对映选择性(ee> 99%)的aza-Henry产品(相对于亚胺而言为80%)和与硝基乙烷具有优异对映选择性的高合成选择性产品。二聚手性Cu(II)络合物1A