Access to Functionalized Quaternary Stereocenters via the Copper-Catalyzed Conjugate Addition of Monoorganozinc Bromide Reagents Enabled by <i>N</i>,<i>N-</i>Dimethylacetamide
作者:Tyler J. Fulton、Phebe L. Alley、Heather R. Rensch、Adriana M. Ackerman、Cameron B. Berlin、Michael R. Krout
DOI:10.1021/acs.joc.8b02201
日期:2018.12.7
reagents, readily obtained from alkyl bromides, display excellent reactivity with β,β-disubstituted enones and TMSCl in the presence of Cu(I) and Cu(II) salts to synthesize a variety of cyclic functionalized β-quaternary ketones in 38–99% yields and 9:1–20:1 diastereoselectivities. The conjugate addition features a pronounced improvement in DMA using monoorganozinc bromide reagents. A simple one-pot protocol
Copper(II)-Catalyzed Aromatization Followed by Bromination of Cyclohexenones Leading to Phenols and Bromophenols
作者:Hung-Chun Tong、K. Rajender Reddy、Shiuh-Tzung Liu
DOI:10.1002/ejoc.201400158
日期:2014.5
Conversion of substituted cyclohexenones into the corresponding phenols can be achieved using copper acetate as the catalyst in the presence of LiBr and CF3COOH under oxygen. With the use of excess LiBr, electrophilic aromatic bromination afforded the corresponding bromophenol under similar catalytic conditions.
Base-Mediated Aerobic Oxidation of Hagemann's Ester: Competitive Hydroxylation at C-1 and C-3 Positions
作者:Sung-Hwan Kim、Hyun-Seung Lee、Bo-Ram Park、Jae-Nyoung Kim
DOI:10.5012/bkcs.2011.32.5.1725
日期:2011.5.20
The reaction of Hagemann’s ester andan electrophile can occur theoretically at C-1, C-3, C-5, andC-2’ positions (Fig. 1). As an example, however, it has beengenerally accepted that the site preference for alkylation wasC-3, the resulting C-3-alkyl derivatives often being accom-panied by small amounts of the C-1-alkyl products.
Silicon in organic synthesis. 25. Thermolysis and desiliconation-alkylation of [1-(trimethylsilyl)cyclopropyl]ethylenes as a route to spirocyclic sesquiterpenes