CHIRAL DIENE LIGANDS, A FABRICATION METHOD THEREOF AND APPLICATIONS THEREOF
申请人:WU Hsyueh-Liang
公开号:US20130096348A1
公开(公告)日:2013-04-18
The present invention proposes a chiral diene ligand, a fabrication method thereof and applications thereof. The chiral diene ligand is a bicyclo[2.2.1] diene ligand having structural specificity and high stability, which favors the bicyclo[2.2.1] diene ligand to take part in asymmetric transformations, particularly an asymmetric addition reaction involving a metal catalyst in a basic environment. Most of the products of the reactions implemented by the chiral diene ligands of the present invention have superior optical activity. The method of the present invention comprises a first oxidation step, a saponification step, a second oxidation step, a deprotonation step, and a cross-coupling step. The chiral diene ligand of the present invention is very suitable to be used in the fabrication or synthesis of various chemicals and medical products.
A dual-metal-catalyzed asymmetric [3+2] annulation of 2-vinyloxiranes with the challenging nucleophilic dipoles (imino esters) was achieved. It was successfully applied to the stereodivergent synthesis of structurally rigid spirocyclic framework. A series of spirocompounds bearing a pyrroline and an olefin were synthesized in an enantio- and diastereodivergent manner.
highly enantioenriched cyclic β-aryl-substituted carbonyl compounds has been achieved through the RhI-catalyzed asymmetric1,4-addition of an array of arylboronicacids to cyclic α,β-unsaturated carbonyl compounds. In the presence of 0.1 or 0.5 mol-% of the RhI/1g complex, the products of conjugate addition were isolated in 89 to 98 % ee and in good to excellent yield.
date. Here we report for the first time the highly enantioselective C–H alkenylation of quinoline- and pyridine-substituted ferrocenes with alkynes by a half-sandwich scandium catalyst. This protocol features broad substrate scope, high enantioselectivity, and 100% atom efficiency, selectively affording a newfamily of planar-chiral ferrocenes bearing N/alkene functionalities. The mechanistic details