Acyl Radicals from α-Keto Acids Using a Carbonyl Photocatalyst: Photoredox-Catalyzed Synthesis of Ketones
作者:Da-Liang Zhu、Qi Wu、David James Young、Hao Wang、Zhi-Gang Ren、Hong-Xi Li
DOI:10.1021/acs.orglett.0c02351
日期:2020.9.4
Acylradicals have been generated from α-keto acids using inexpensive and commercially available 2-chloro-thioxanthen-9-one as the photoredox catalyst under visible light illumination. These reactive species added to olefins or coupled with aryl halides via a bipyridyl-stabilized Ni(II) catalyst, enabling easy access to a diverse range of ketones. This reliable, atom-economical, and eco-friendly protocol
Copper-Catalyzed Synthesis of γ-Amino Acids Featuring Quaternary Stereocenters
作者:José Enrique Gómez、Wusheng Guo、Silvia Gaspa、Arjan W. Kleij
DOI:10.1002/anie.201709511
日期:2017.11.20
Open sesame: The first general asymmetric synthesis of γ,γ-disubstituted γ-amino acids by copper-catalyzed ring opening of nonstrained lactones with amines is reported. This catalytic system allows the synthesis of a series of highly functionalized γ-amino acids, featuring quaternary stereocenters, with excellent enantiomeric ratios of up to 98:2 and yields of up to 98 %.
Highlyenantioselectivehydrosilylation of γ-iminoesters with trichlorosilane promoted by a chiral Lewisbase proceeded smoothly to provide various optically active γ-amino esters in good yields (up to 96 %) with excellent enantioselectivities (up to 99 % ee) at –10 °C in Cl2CHCHCl2. The side reactions were successfully reduced by rational modification of the substrate. The absolute configuration
There is provided a compound of Formula I
wherein the various symbols are as defined in the description, and a method of manufacturing a medicament for use in the therapy of a condition or disease associated with 17β-hydroxysteroid dehydrogenase (17β-HSD), comprising a compound of Formula I.