Palladium-Catalyzed Asymmetric Conjugate Addition of Arylboronic Acids to Heterocyclic Acceptors
作者:Jeffrey C. Holder、Alexander N. Marziale、Michele Gatti、Bin Mao、Brian M. Stoltz
DOI:10.1002/chem.201203643
日期:2013.1.2
Flava Flavanone: Asymmetricconjugateadditions to chromones and 4‐quinolones are reported utilizing a single catalyst system formed in situ from Pd(OCOCF3)2 and (S)‐tBuPyOX. Notably, these reactions are performed in wet solvent under ambient atmosphere, and employ readily available arylboronicacids as the nucleophile, thus providing ready access to these asymmetric heterocycles (see scheme).
Highly Enantioselective Catalytic Addition of Grignard Reagents to N‐Heterocyclic Acceptors
作者:Yafei Guo、Syuzanna R. Harutyunyan
DOI:10.1002/anie.201906237
日期:2019.9.9
greatly sought after because of their significance in medicinal chemistry. Described here is the first general catalytic methodology to access a wide variety of chiral 2‐ and 4‐substituted tetrahydro‐quinolones, dihydro‐4‐pyridones, and piperidones with excellent yields and enantioselectivities, utilizing a single catalyst system.
Direct Enantio- and Diastereoselective Vinylogous Addition of Butenolides to Chromones Catalyzed by Zn-ProPhenol
作者:Barry M. Trost、Elumalai Gnanamani、Christopher A. Kalnmals、Chao-I “Joey” Hung、Jacob S. Tracy
DOI:10.1021/jacs.8b13367
日期:2019.1.30
We report the first enantio- and diastereoselective 1,4-addition of butenolides to chromones. Both α,β- and β,γ-butenolide nucleophiles are compatible with the Zn-ProPhenol catalyst, and preactivation as the siloxyfurans is not required. The scope of electrophiles includes a variety of substituted chromones, as well as a thiochromone and a quinolone, and the resulting vinylogous addition products are
Asymmetric Synthesis of 2-Aryl-2,3-dihydro-4-quinolones by Rhodium-Catalyzed 1,4-Addition of Arylzinc Reagents in the Presence of Chlorotrimethylsilane
[reaction: see text] The first catalytic asymmetricsynthesis of 2-aryl-2,3-dihydro-4-quinolones has been developed by way of a rhodium-catalyzed 1,4-addition of arylzinc reagents to 4-quinolones. These 1,4-adducts can be obtained with high enantioselectivity by the use of (R)-binap as a ligand, and high yields are realized by conducting the reactions in the presence of chlorotrimethylsilane.
2-Aminobuta-1,3-dienes as annulation reagents for 4-quinolones and benzothiopyran-4-ones: an attractive route for the highly diastereoselective synthesis of acridine- and thioxanthene-derivatives
作者:Uwe Beifuss、Michael Taraschewski
DOI:10.1039/a704289b
日期:——
Enamines regioselectively add to the CN+-bond of 4-silyloxyquinolinium triflates with high yields, and the BF3·Et2O mediated annulations of 4-quinolones with 2-aminobuta-1,3-dienes proceed with high diastereoselectivity to give substituted 1,2,3,4,4a,9,9a,10-octahydroacridine-3,9-dione derivatives; 4-silyloxy-1-benzothiopyrylium triflates and benzothiopyran-4-ones behave analogously.