Diastereoselective Oxidative Carbon−Carbon Bond Formation via Silyl Bis-enol Ethers
作者:Christopher T. Avetta、Leah C. Konkol、Carla N. Taylor、Karen C. Dugan、Charlotte L. Stern、Regan J. Thomson
DOI:10.1021/ol802516z
日期:2008.12.18
Diisopropylsilyl bis-enol ethers are shown to be powerful intermediates for the diastereoselective dimerization and cross-coupling of cyclic ketones. The trends observed for the oxidative coupling of a range of different dialkylsilyl bis-enol ethers derived from cyclohexanone are rationalized by invoking a stereochemical model based on a Thorpe-Ingold effect.
Lewis-Acid-Mediated Union of Epoxy-Carvone Diastereomers with Anisole Derivatives: Mechanistic Insight and Application to the Synthesis of Non-natural CBD Analogues
作者:Sophia J. Bailey、Rishi R. Sapkota、Alexandra E. Golliher、Barry Dungan、Marat Talipov、F. Omar Holguin、William A. Maio
DOI:10.1021/acs.orglett.8b01909
日期:2018.8.3
The use of trimethylsilyl trifluoromethanesulfonate as a mild means to unite epoxy-carvone silyl ethers with anisolederivatives to yield products that are structurally similar to the CBD scaffold is reported. Importantly, unlike related methods, this process can utilize both epoxy-carvone diastereomers and does not require the use of air/moisture-sensitive organometallic reagents. Several examples
Electrochemical and Photocatalytic Oxidative Coupling of Ketones via Silyl Bis-enol Ethers
作者:Aidan C. Caravana、Benjamin Nagasing、Sandeep Dhanju、Rebekah G. Reynolds、Emily A. Weiss、Regan J. Thomson
DOI:10.1021/acs.joc.1c00384
日期:2021.5.7
Diastereoselective oxidative coupling of ketones through a silyl bis-enol ether intermediate by anodic and photocatalytic oxidation is reported. These methods provide several 1,4-diketones in good yields without the need for stoichiometric metal oxidants. The strategic use of a silicon tether enables the coupling of both aromatic and aliphatic ketones as well as the synthesis of quaternary centers
Synthesis, atropoisomerism and chemistry of the dimers of R-(−)-carvone, R-(−)-hydrocarvone, 1R,5R-(+)-pinocarvone and other monoterpenic ketones
作者:Marco Mazzega、Fabrizio Fabris、Sergio Cossu、Ottorino De Lucchi、Vittorio Lucchini、Giovanni Valle
DOI:10.1016/s0040-4020(99)00131-3
日期:1999.4
Oxidative homocoupling of R-(−)-carvone 4, R-(−)-hydrocarvone 21, 1R,5R-(+)-pinocarvone25 and other monoterpenic ketones leads to the respective C2-symmetric dimers 6, 20 and 26 in most cases as single diastereoisomers. Subsequent reactions of dimeric compounds were investigated in detail. Other monoterpenes (menthone, pulegone) undergo homocoupling in low yields and poor diastereoselectivity.