Van Craen David, Begall Jenny, Großkurth Johannes, Himmel Leonard, Linnenberg Oliver, Isaak Elisabeth, Albrecht Markus
Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
Beilstein J Org Chem. 2020 Sep 24;16:2338-2345. doi: 10.3762/bjoc.16.195. eCollection 2020.
The stereoselectivity of a Diels-Alder reaction within the periphery of hierarchically assembled titanium(IV) helicates formed from mixtures of achiral, reactive and chiral, unreactive ligands was investigated in detail. Following the pathway of the chiral induction, the chiral ligands, solvents as well as substituents at the dienophile were carefully varied. Based on the results of the stoichiometric reaction, a secondary amine-catalyzed nitro-Michael reaction is performed as well which afforded reasonable diastereoselectivities.
详细研究了由非手性、反应性配体与手性、非反应性配体混合物形成的分级组装钛(IV)螺旋体周边内狄尔斯-阿尔德反应的立体选择性。沿着手性诱导途径,对手性配体、溶剂以及亲双烯体上的取代基进行了仔细的变化。基于化学计量反应的结果,还进行了仲胺催化的硝基迈克尔反应,该反应提供了合理的非对映选择性。