Co(I)-Catalyzed [3 + 2] Annulation of <i>o</i>-Haloaryl Imines with Alkenes for the Synthesis of Indanamines
作者:Jérôme Paul、Lisa Luong Van My、Myriam Behar-Pirès、Coralie Guillaume、Eric Léonel、Marc Presset、Erwan Le Gall
DOI:10.1021/acs.joc.8b00551
日期:2018.4.6
The use of a CoBr2/1,10-phenanthroline catalytic system together with Zn as the reductant was developed to prepare diversely substituted indanamines by a Co(I)-catalyzed [3 + 2] annulation of o-haloaryl imines with electron-deficient alkenes in good yields. The use of Mn as the reductant allowed the elaboration of a three-component version of this reaction. These conditions were also found to be suitable
A Highly Tunable Stereoselective Olefination of Semistabilized Triphenylphosphonium Ylides with <i>N</i>-Sulfonyl Imines
作者:De-Jun Dong、Hai-Hua Li、Shi-Kai Tian
DOI:10.1021/ja910238f
日期:2010.4.14
The Wittigreaction involving direct olefination of triphenylphosphonium ylides (Ph(3)P horizontal lineCHR) with aldehydes is arguably the most often used method for alkene synthesis, but in general it yields mixtures of Z- and E-alkenes for semistabilized triphenylphosphonium ylides (R = aryl or vinyl). We have developed a simple and efficient protocol to improve the stereoselectivity significantly
Catalyst free decarboxylative trichloromethylation of aldimines
作者:Eloah P. Ávila、Isabella F. de Souza、Alline V. B. Oliveira、Vinicius Kartnaller、João Cajaiba、Rodrigo O. M. A. de Souza、Charlane C. Corrêa、Giovanni W. Amarante
DOI:10.1039/c6ra23936f
日期:——
A catalystfree decarboxylative trichloromethylation of imines to afford different trichloromethyl sulfonyl and sulfinyl amines has been presented. Only DMSO as a solvent at room temperature was necessary to provide the corresponding products in good to high isolated yields. A highly diastereoselective version was carried out, leading to the sulfinylimine with good yield and near perfect diastereoselectivity
Tunable stereoselective alkene synthesis by treatment of activated imines with nonstabilized phosphonium ylides
作者:De-Jun Dong、Yuan Li、Jie-Qi Wang、Shi-Kai Tian
DOI:10.1039/c0cc04739b
日期:——
A broad range of readily accessible N-sulfonyl imines undergo olefination reaction with nonstabilized phosphoniumylides under mild conditions to afford an array of both Z- and E-isomers of 1,2-disubstituted alkenes, allylic alcohols, and allylic amines in good yields and with greater than 99 : 1 stereoselectivity.
Chiral Brønsted Acid-Catalyzed Stereoselective Mannich-Type Reaction of Azlactones with Aldimines
作者:Eloah P. Ávila、Rodrigo M. S. Justo、Vanessa P. Gonçalves、Adriane A. Pereira、Renata Diniz、Giovanni W. Amarante
DOI:10.1021/jo5024975
日期:2015.1.2
A highly diastereo- and enantioselective Mannich-type reaction of azlactones with aldimines catalyzed by a chiral phosphoric acid is described. Only 3 mol % catalyst was required to prepare the Mannich adducts in good yields with high stereochemical control (up to >19:1 dr, >99:1 er). Moreover, the final product contains two consecutive stereogenic centers, one of which is quaternary.