Asymmetric aza-Michael additions of 4-nitrophthalimide to nitroalkenes and preliminary study of the products for herbicidal activities
摘要:
The first application of 4-nitrophthalimide as nitrogen nucleophile for enantioselective aza-Michael addition to nitroalkenes has been developed. The process is promoted by chiral thiourea catalyst derived from cinchonine to give corresponding Michael adducts with up to 87% ee. Activity test showed that some products of the reaction have moderate or good herbicidal activity against cole and barnyard grass at 100 mu g/ml. (C) 2013 Elsevier Ltd. All rights reserved.
The synthesis and characterization of new copper(II)-L-3,4-dihydroxyphenyylalanine based magnetically separable nanocatalyst, namely Fe3O4@L-DOPA@Cu-II (L-DOPA = L-3,4-dihydroxyphenyylalanine), are described. The catalyst has been characterized by physicochemical studies. We have studied the application of this new catalyst for asymmetric aza-Michael addition reaction. This catalyst could simply be separated and recovered from the reaction mixture with the assistance of an external magnet and reused several times. (C) 2016 Elsevier B.V. All rights reserved.
Asymmetric aza-Michael additions of 4-nitrophthalimide to nitroalkenes and preliminary study of the products for herbicidal activities
作者:Shijun Ma、Lulu Wu、Ming Liu、Yaodong Huang、Yongmei Wang
DOI:10.1016/j.tet.2013.01.043
日期:2013.3
The first application of 4-nitrophthalimide as nitrogen nucleophile for enantioselective aza-Michael addition to nitroalkenes has been developed. The process is promoted by chiral thiourea catalyst derived from cinchonine to give corresponding Michael adducts with up to 87% ee. Activity test showed that some products of the reaction have moderate or good herbicidal activity against cole and barnyard grass at 100 mu g/ml. (C) 2013 Elsevier Ltd. All rights reserved.