Rhodium-Catalyzed Asymmetric 1,4-Addition of Heteroaryl Cyclic Triolborate to α,β-Unsaturated Carbonyl Compounds
作者:Yasunori Yamamoto、Norio Miyaura、Xiao-Qiang Yu
DOI:10.1055/s-0028-1088198
日期:2009.4
Rhodium-catalyzed asymmetric 1,4-additions of electron-deficient heteroaryl groups to α,β-unsaturated carbonyl compounds were established. The reaction resulted in very low yields due to competitive C-B bond cleavage when arylboronic acids, their pinacol esters, or potassium trifluoroborates were used. However, the corresponding lithium heteroaryl(triol)borates afforded 1,4-adducts with high enantioselectivities up to 97% in the presence of a rhodium(I) catalyst chelated with a chiral BINAP or BIPAM ligand.
Multifunctionalization of Unactivated Cyclic Ketones via Synergistic Catalysis of Copper and Diarylamine: Access to Cyclic α-Enaminone
作者:Yang Li、Ran Zhang、Xihe Bi、Junkai Fu
DOI:10.1021/acs.orglett.8b00125
日期:2018.2.16
A multifunctionalization of unactivated cyclicketonesvia synergistic catalysis of copper and diarylamine for the direct synthesis of cyclic α-enaminone is reported for the first time. This reaction goes through oxidative α-amination, followed by a desaturation, and features mild reaction conditions, a broad substrate scope, and great functional group tolerance.