Chemoselective efficient synthesis of functionalized β-oxonitriles through cyanomethylation of Weinreb amides
作者:Ashenafi Damtew Mamuye、Laura Castoldi、Ugo Azzena、Wolfgang Holzer、Vittorio Pace
DOI:10.1039/c4ob02398f
日期:——
Homologation of Weinreb amides with cyanomethyllithium: a new route to β-oxonitriles.
Weinreb酰胺与氰甲基锂的同源化反应:β-氧代腈的新途径。
Copper-Catalyzed Asymmetric Conjugate Addition of Dimethylzinc to Acyl-<i>N</i>
-methylimidazole Michael Acceptors: Scope, Limitations and Iterative Reactions
作者:Sammy Drissi-Amraoui、Thibault E. Schmid、Jimmy Lauberteaux、Christophe Crévisy、Olivier Baslé、Renata Marcia de Figueiredo、Stéphanie Halbert、Hélène Gérard、Marc Mauduit、Jean-Marc Campagne
DOI:10.1002/adsc.201600458
日期:2016.7.28
An efficient copper‐catalyzed enantioselective conjugateaddition of dimethylzinc to unsaturated 2‐acyl‐N‐methylimidazoles has been achieved using a chiral bidentate hydroxyalkyl‐NHC ligand. The reactions proceed with excellent regioselectivity (1,4 vs. 1,6 and 1,8) in extended conjugated systems to afford the 1,4‐adducts in high enantioselectivities. This regioselectivity could be ascertained by DFT
Asymmetric Gold(I)‐Catalyzed Tandem Hydroarylation–Nazarov Cyclization: Enantioselective Access to Cyclopentenones
作者:Marta Solas、Samuel Suárez‐Pantiga、Roberto Sanz
DOI:10.1002/anie.202207406
日期:2022.8.26
A new enantioselective version of the Nazarov cyclization is reported. The reaction design uses readily available alkenynones to trigger a gold(I)-catalyzed anti-Michael hydroarylation of the ynone followed by Nazarov cyclization. A chiral gold complex is able to control the absolute stereochemistry of the process. Cyclopenta[c]chromenones, which combine the 2H-chromene and cylopentanone cores, are
报道了纳扎罗夫环化的新对映选择性版本。该反应设计使用容易获得的烯炔酮来触发炔酮的金(I)催化的反迈克尔加氢芳基化,然后进行纳扎罗夫环化。手性金络合物能够控制该过程的绝对立体化学。环戊[ c ]色酮结合了 2 H-色烯和环戊酮核心,合成时具有高产率和ee值。
Remote steric effect on the regioselectivity of Sharpless asymmetric dihydroxylation
作者:Yan Zhang、George A. O'Doherty
DOI:10.1016/j.tet.2005.03.119
日期:2005.6
Studies on the regioselectivities for the Sharpless asymmetric dillydroxylation (AD) of conjugated dienoates, trienoates, dienones and dienamides are described. Excellent regioselectivities were obtained in straight chain dienoates, all trienoates, ketones damicles. The remote branched iso-propyl and tert-butyl groups of dienoates greatly lowered the normally excellent regiocontrol. This observation is rationalized in terms of substrate conformational changes, and the steric interaction between the branched methyl group of iso-propyl ortertbutyl groups and the ethyl group Oil the (DHQD)(2)PHAL ligand. (c) 2005 Elsevier Ltd. All rights reserved.
Stereoselective Synthesis of Dienyl-Carboxylate Building Blocks: Formal Synthesis of Inthomycin C
作者:Caroline Souris、Frédéric Frébault、Ashay Patel、Davide Audisio、K. N. Houk、Nuno Maulide
DOI:10.1021/ol401226y
日期:2013.7.5
A direct synthesis of stereodefined halodienes is reported. Those key building blocks enable a concise access to polyenic products, as demonstrated in a modular synthesis of Inthomycin C.