Confinement‐Driven Enantioselectivity in 3D Porous Chiral Covalent Organic Frameworks
作者:Bang Hou、Shi Yang、Kuiwei Yang、Xing Han、Xianhui Tang、Yan Liu、Jianwen Jiang、Yong Cui
DOI:10.1002/anie.202013926
日期:2021.3.8
3D covalent organic frameworks (COFs) with well‐defined porous channels are shown to be capable of inducing chiral molecular catalysts from non‐enantioselective to highly enantioselective in catalyzing organic transformations. By condensations of a tetrahedral tetraamine and two linear dialdehydes derived from enantiopure 1,1′‐binaphthol (BINOL), two chiral 3D COFs with a 9‐fold or 11‐fold interpenetrated
Regulation of Chiral Phosphoric Acid Catalyzed Asymmetric Reaction through Crown Ether Based Host–Guest Chemistry
作者:Jiadong Tang、Can Chen、Tao Hong、Zibin Zhang、Chunsong Xie、Shijun Li
DOI:10.1021/acs.orglett.2c03091
日期:2022.11.4
in-depth intersection of supramolecular chemistry and asymmetric catalysis due to its unique advantages in building chiral catalyst libraries and regulating performance of catalysts. Herein, we combine crown ether based host–guest chemistry with chiral phosphoricacidmediated asymmetric catalysis to actualize the supramolecular regulation of catalytic asymmetric two-component tandem acetalization
Highly Enantioselective Synthesis of 2,3-Dihydroquinazolinones through Intramolecular Amidation of Imines
作者:Muthuraj Prakash、Venkitasamy Kesavan
DOI:10.1021/ol300518m
日期:2012.4.6
Enantioselective synthesis of 2,3-dihydroquinazolinones (DHOZs) was accomplished using readily available Sc(III)-inda-pybox as the catalyst. This is the first report on the metal catalyzed asymmetric intramolecular amidation of imines to synthesize DHQs.
Investigation of the Enantioselective Synthesis of 2,3-Dihydroquinazolinones Using Sc(III)-inda-pybox
Derivatives of 2,3-dihydroquinazolinones (2,3-DHQZs) are prized for their prevalent pharmaceutical applications. Although there are potential applications, methods available for the enantioselective synthesis of these valuable compounds are scarce, since the chiral aminal center is prone to racemization. We have overcome the difficulties in the catalytic enantioselective synthesis of 2,3-DHQZs using Sc(III)-inda-pybox as a catalyst, in a process with a broad substrate scope.
Highly Enantioselective Synthesis of Dihydroquinazolinones Catalyzed by SPINOL-Phosphoric Acids
作者:Dan Huang、Xuejian Li、Fangxi Xu、Luhang Li、Xufeng Lin
DOI:10.1021/cs400591u
日期:2013.10.4
The asymmetric condensation/amine addition cascade sequence of 2-aminobenzamides and aldehydes catalyzed by chiral spirocyclic SPINOL-phosphoric acids was realized. SPINOL-phosphoric acid 1j was found to be a general, highly enantioselective organocatalyst for such cascade reactions at room temperature, affording 2,3-dihydroquinazolinones in excellent yields (up to 99%) with good to excellent ee's (up to 98%). The best level of stereocontrol was obtained for aromatic aldehydes with an ortho substituent.