Some novel prolinal dithioacetal derivatives have been synthesized and applied as the organocatalysts for the direct Michaeladdition of ketones and aldehydes to nitroalkenes. High enantioselectivities and diastereoselectivities have been obtained in both organic and aqueous media (dichloromethane, water, or brine).
Chiral picolylamines for Michael and aldol reactions: probing substrate boundaries
作者:Thomas C. Nugent、Ahtaram Bibi、Abdul Sadiq、Mohammad Shoaib、M. Naveed Umar、Foad N. Tehrani
DOI:10.1039/c2ob26382c
日期:——
organocatalyst template, a vicinal chiral diamine based on a pyridine-primary amine motif. The addition of cyclohexanone to β-nitrostyrene has many catalyst solutions, but cyclopentanone and isobutyraldehydeadditions continue to be challenging. PicAm-3 (10 mol%) readily allows the Michael addition of cyclopentanone or isobutyraldehyde (5.0 equiv.) to β-nitrostyrene derivatives. By contrast, PicAm-1 (7.0 mol%)
Enantioselective aminocatalysis: Michael addition of unactivated ketones to nitroolefins catalyzed by D-fructose derived monofunctional primary amine
作者:Khiangte Vanlaldinpuia、Porag Bora、Grace Basumatary、Rahul Mohanta、Ghanashyam Bez
DOI:10.1007/s12039-017-1371-6
日期:2017.10
synthesis \(\upgamma \)-nitro carbonylcompounds. Here we report our preliminary results on the enantioselective Michael addition of different ketones to nitro olefins catalysed by monofunctional primary amine (1) derived from d-fructose. Graphical AbstractMonofunctional primary amine is used for the first time as catalyst for stereoselective Michael addition reaction of different ketones to nitro
A new hydroxyphthalimide-coupled triazole-pyrrolidine derivative has been synthesized and demonstrated as an efficient and stereoselective organocatalyst for the asymmetric Michael addition reaction of ketones to nitro olefins at room temperature. Good yields and high selectivities were achieved when benzoic acid was used in combination with organocatalyst 1, employing water as the reaction medium. (C) 2010 Elsevier Ltd. All rights reserved.
l-Prolinal Dithioacetal: A Highly Effective Organocatalyst for the Direct Nitro-Michael Addition to Selected Cyclic and Aromatic Ketones
作者:Piotr Pomarański、Zbigniew Czarnocki
DOI:10.1055/s-0037-1611531
日期:2019.9
trans-β-nitrostyrenes. Also, the first asymmetric syntheses of selected 2-methyl-4-nitro-1,3-diphenylbutan-1-one derivatives by application of the obtained organocatalyst is presented. The synthesis of novel l-prolinal dithioacetal and its application as an organocatalyst for the direct Michael addition of cyclic ketones and acetophenone derivatives to trans-β-nitrostyrene and related compounds is described