Decarboxylative Mannich Reactions with Substituted Malonic Acid Half-Oxyesters
作者:Tania Xavier、Sylvie Condon、Christophe Pichon、Erwan Le Gall、Marc Presset
DOI:10.1021/acs.joc.0c02895
日期:2021.4.16
The decarboxylative Mannich reaction between imines and substituted malonicacids half-oxyesters (SMAHOs) has been developed using 1,4-diazabicyclo[2.2.2]octane (DABCO) as an organocatalyst. The reaction proceeds under simple reaction conditions and tolerates a broad range of substrates, affording general access to β2,3-aminoesters, the syn diastereomer being the major one. An alternative multicomponent
Racemicazlactones are transformed into valuable chiral heterocycles via an asymmetric organocatalytic Mannich reaction followed by gold‐catalyzed cyclization or reduction.
外消旋的内酯通过不对称的有机催化曼尼希反应转化为有价值的手性杂环,然后进行金催化的环化或还原反应。
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-Arylamines Coupled with Aldehydes, Ketones, and Imines by Means of Photocatalytic Proton-Coupled Electron Transfer
作者:Qing Xia、Hao Tian、Jianyang Dong、Yi Qu、Lili Li、Hongjian Song、Yuxiu Liu、Qingmin Wang
DOI:10.1002/chem.201801886
日期:2018.7.2
A photoredox‐catalyzed umpolung strategy for coupling reactions between aldehydes, ketones, imines, and N‐arylamines is reported. These reactions proceed by a Brønstedacid‐activated proton‐coupled electron transfer pathway, and the protocol was used to synthesize a broad scope of 1,2‐amino alcohols and vicinal diamines, both of which are common motifs in biologically active natural products, pharmaceutically
Catalytic, Asymmetric Aza-Baylis-Hillman Reaction ofN-Sulfonated Imines with Activated Olefins by Quinidine-Derived Chiral Amines
作者:Min Shi、Yong-Mei Xu、Yong-Ling Shi
DOI:10.1002/chem.200400872
日期:2005.3.4
such as methyl vinyl ketone (MVK), ethyl vinyl ketone (EVK), acrolein, methylacrylate, phenyl acrylate, or alpha-naphthyl acrylate to give the corresponding adducts in moderate to good yields with good to high ee (up to 99 %) at -30 degrees C or 45 degrees C in various solvents, including DMF/MeCN (1:1, v/v). The first such reaction of 1 with the simplest Michael acceptor MVK and methylacrylate has been
A multicomponent approach to the synthesis of N-sulfonyl β2,3-amino esters
作者:Erwan Le Gall、Stéphane Sengmany、Issa Samb、Sabrina Benakrour、Christopher Colin、Antoine Pignon、Eric Léonel
DOI:10.1039/c3ob42353k
日期:——
The multicomponent synthesis of α,β-disubstituted N-sulfonyl β-amino esters is described. It involves a zinc-mediated, cobalt-catalyzed three-component reaction between sulfonylimines, acrylates and organic bromides. A possible mechanism is proposed, emphasizing the intermediate formation of an organocobalt as the initiator of a Mannich-like process.