Suzuki–Miyaura Coupling of Simple Ketones via Activation of Unstrained Carbon–Carbon Bonds
作者:Ying Xia、Jianchun Wang、Guangbin Dong
DOI:10.1021/jacs.8b02462
日期:2018.4.25
Here, we describe that simple ketones can be efficiently employed as electrophiles in Suzuki-Miyauracoupling reactions via catalytic activation of unstrained C-C bonds. A range of common ketones, such as cyclopentanones, acetophenones, acetone and 1-indanones, could be directly coupled with various arylboronates in high site-selectivity, which offers a distinct entry to more functionalized aromatic
在这里,我们描述了通过催化激活无张力的 CC 键,简单的酮可以在 Suzuki-Miyaura 偶联反应中有效地用作亲电子试剂。一系列常见的酮,如环戊酮、苯乙酮、丙酮和1-茚满酮,可以直接与各种芳基硼酸酯以高位点选择性偶联,这为获得更多功能化的芳香酮提供了独特的途径。初步机理研究表明酮 α-CC 键通过氧化加成断裂。
Stereodivergent Synthesis of Trisubstituted Enamides: Direct Access to Both Pure Geometrical Isomers
作者:Luca Massaro、Jianping Yang、Suppachai Krajangsri、Emanuele Silvi、Thishana Singh、Pher G. Andersson
DOI:10.1021/acs.joc.9b01803
日期:2019.11.1
either (E)- or (Z)-isomers of trisubstituted enamides. Starting from an extensive range of ketones, it was possible to synthesize and isolate the desired pure isomer by switching the reaction conditions. Lewis acid activation enables the formation of the (E)-isomers in high stereoselectivity (>90:10) and good yields. On the other hand, the use of a Brønsted acid allows the preparation of the (Z)-isomers
Combined Theoretical and Experimental Studies Unravel Multiple Pathways to Convergent Asymmetric Hydrogenation of Enamides
作者:Jianping Yang、Luca Massaro、Suppachai Krajangsri、Thishana Singh、Hao Su、Emanuele Silvi、Sudipta Ponra、Lars Eriksson、Mårten S. G. Ahlquist、Pher G. Andersson
DOI:10.1021/jacs.1c09573
日期:2021.12.29
We present a highly efficient convergent asymmetric hydrogenation of E/Z mixtures of enamides catalyzed by N,P–iridium complexes supported by mechanistic studies. It was found that reduction of the olefinic isomers (E and Z geometries) produces chiral amides with the same absolute configuration (enantioconvergent hydrogenation). This allowed the hydrogenation of a wide range of E/Z mixtures of trisubstituted
Long chain phenols. Part 17. The synthesis of 5-[(Z)-pentadec-8-enyl]resorcinol, ‘cardol monoene,’ and of 5-[(ZZ)-pentadec-8,11-dienyl]-resorcinol dimethyl ether, ‘cardol diene’ dimethyl ether
作者:Christopher J. Baylis、Stanley W. D. Odle、John H. P. Tyman
DOI:10.1039/p19810000132
日期:——
the bromide and alkylation of lithio-oct-1-yne gave 5-(pentadec-8-ynyl)resorcinol dimethyl ether which was selectively converted into the 8-(Z)-alkene. Demethylation with lithium iodide gave 5-[(Z)-pentadec-8-enyl]resorcinol which was identical to ‘cardol monoene’. Reaction of 7-(3,5-dimethoxyphenyl)heptyl bromide with the lithium derivative of OH-protected propargyl alcohol, gave after acidic treatment
[EN] PROCESS FOR PREPARING SUBSTITUTED PHENYLALKANES<br/>[FR] PROCÉDÉ POUR PRÉPARER DES PHÉNYLALCANES SUBSTITUÉS
申请人:MALLINCKRODT LLC
公开号:WO2016007823A1
公开(公告)日:2016-01-14
The invention provides methods for preparing substituted phenylalkanes. In particular, the processes comprise reacting a phenyl boronic compound with an α-β unsaturated carbonyl-containing compound via an asymmetric 1,4-addition reaction. The processes may be useful in the synthesis of tapentadol.