straightforward synthetic approach to completely unsymmetrical triarylmethanes through the situ‐generated o‐quinone methides from readily available starting materials has been successfully developed. In the presence of an Fe(III) salt, three different aromatic rings, including salicylaldehydes, arylboronic acids, and arenes, were incorporated into one molecule in a single step under the base/ligand‐free
FeCl<sub>3</sub>-Mediated Synthesis of β-Alkynyl Ketones via Domino Nucleophilic-Substitution/Intramolecular-Cyclization/Reverse Claisen Condensation of <i>N</i>-Cyclohexyl Propargylamines and 1,3-Diketones
作者:Yongjia Shang、Xiaoqian Hu、Xinwei He、Jiajia Tao、Guang Han、Fuli Wu、Jie Wang
DOI:10.1021/acs.joc.5b00281
日期:2015.5.1
The synthesis of β-alkynyl ketones was achieved in good to excellent yields by an iron-catalyzed domino reaction of N-cyclohexyl propargylamines and 1,3-diketones. A plausible mechanism involving nucleophilic substitution, intramolecular cyclization, and reverse Claisen condensation for this process is proposed.
Copper-Catalyzed Regioselective Intramolecular Oxidative α-Functionalization of Tertiary Amines: An Efficient Synthesis of Dihydro-1,3-Oxazines
作者:Mohit L. Deb、Suvendu S. Dey、Isabel Bento、M. Teresa Barros、Christopher D. Maycock
DOI:10.1002/anie.201304654
日期:2013.9.9
Traffic control: The hydroxy functional group directs the α‐functionalization of tertiary amines, synthesizing 1,3‐oxazines by CO bond formation. Reaction occurs with both benzylic and non‐benzylic amines. In the case of naphthoxazine synthesis, 100 % diastereoselectivity was observed. A tentative two‐pathway mechanism is proposed for the reaction.
A simple, general route to the 2,3-dihydrobenzofurans substituted at C3 by an aryethynyl or aryl group, starting from propargylamine and itsderivatives with benzoyl sulfonium salts, has been developed. This reaction involved an in situ generated o-quinone methide (o-QM) intermediate followed by [4+1] annulation with sulfur ylides. Notably, this protocol's features include moderate to excellent yields