The asymmetric challenge! New camphor‐based prolinamides were designed, synthesized, and proven to be a highly efficient organocatalysts for asymmetricMichael reactions. Treatment of unmodified aldehydes with nitroalkenes in the presence of 5–10 mol % organocatalysts provided the desired Michael products in high chemical yields (up to 94 %) and high to excellent levels of diastereo‐ and enantioselectivities
Translating the Enantioselective Michael Reaction to a Continuous Flow Paradigm with an Immobilized, Fluorinated Organocatalyst
作者:Irina Sagamanova、Carles Rodríguez-Escrich、István Gábor Molnár、Sonia Sayalero、Ryan Gilmour、Miquel A. Pericàs
DOI:10.1021/acscatal.5b01746
日期:2015.11.6
enantioselective, continuous flow processes allowing either the multigram synthesis of a single Michael adduct over a 13 h period or the sequential generation of a library of enantiopure Michael adducts from different combinations of substrates (13 examples, 16 runs, 18.5 h total operation). A customized in-line aqueous workup, followed by liquid–liquid separation in flow, allows for product isolation
[EN] POLYMER SUPPORTED FLUORINATED ORGANOCATALYST<br/>[FR] ORGANOCATALYSEUR FLUORÉ SUR SUPPORT POLYMÈRE
申请人:FUNDACIÓ INST CATALÀ D'INVESTIGACIÓ QUÍMICA
公开号:WO2017008832A1
公开(公告)日:2017-01-19
Polymer supported fluorinated compound of formula I, wherein the meaning for each R1 is as disclosed in the description. These compounds are useful as catalysts, particularly in Michael addition reactions under continuous flow.
be used as conformational control units of organocatalysts to tune their catalytic properties. New hybrid dipeptide‐like organocatalysts based on ζ‐sugar aminoacids and proline were prepared and tested for the asymmetric Michael addition of aldehydes to β‐nitrostyrenes. Taking full advantage of the modular nature of the carbohydrate motif, both reactivity and stereoselectivity were significantly improved
Proline-derived carboxylic acid as a bifunctional organocatalyst for highly efficient asymmetric Michael addition of aldehydes to nitroalkenes
作者:Hyoung Min Yeo、Taek Hyeon Kim
DOI:10.1016/j.tetlet.2024.155107
日期:2024.6
A novel bifunctional proline amide–carboxylic acid catalyst was used for the highly stereoselective Michael reaction of various aldehydes with different nitroalkenes. This catalyst was easily prepared using commonly available anhydrides and proline linked with a diamine spacer. The asymmetric catalytic Michael reactions afforded high yields (up to 98 %), diastereoselectivities ( ratio: up to 86:14)