The Kharasch reaction revisited: CuX3Li2-catalyzed conjugate addition reactions of Grignard reagents
作者:Manfred T. Reetz、Alois Kindler
DOI:10.1016/0022-328x(95)05699-p
日期:1995.10
The conjugate addition of Grignardreagents RMgX to α,β-unsaturated ketones and esters is effectively catalyzed by soluble copper ate-complexes of the type CuX3Li2, e.g. CuI · 2LiCl. In the presence of Me3SiCl the corresponding ketone enolsilanes are formed in high yield and selectivity. Diasteroselectivity in the case of chiral ketones is similar to that observed by using stoichiometric amounts of
格氏试剂RMgX向α,β-不饱和酮和酯的共轭加成可通过CuX 3 Li 2类型的可溶性铜酸酯络合物(例如CuI·2LiCl )有效地催化。在Me 3 SiCl存在下,可以高产率和高选择性形成相应的酮烯醇硅烷。在手性酮的情况下,非对映选择性类似于通过使用化学计量的铜酸盐R 2 CuLi所观察到的非对映选择性。因此,CuX 3 Li 2催化的格氏试剂的1,4-加成可能是工业上可行的方法。
Equatorial Preference in the GaCl<sub>3</sub>-Promoted Ethenylation of Cyclic Ketones
作者:Masahiko Yamaguchi、Mieko Arisawa、Chie Miyagawa
DOI:10.1055/s-2002-19298
日期:——
Silylenolethers derived from substituted cyclohexanones are ethenylated with trimethylsilylethyne in the presence of GaCl 3 . Carbon-carbonbondformation was completed in less than 5 min at room temperature and protodegallation of the organogallium intermediate formed with 6 M sulfuric acid gave β-enones. The reactions exhibit a bias for the equatorial C-C bondformation, which contrasts the axial
由取代的环己酮衍生的甲硅烷基烯醇醚在 GaCl 3 存在下用三甲基甲硅烷基乙炔乙烯化。在室温下,碳-碳键的形成在不到 5 分钟的时间内完成,用 6 M 硫酸形成的有机镓中间体的原脱镓过程得到 β-烯酮。该反应表现出对赤道CC键形成的偏差,这与烯醇烷基化的轴向立体化学形成对比。讨论了这种立体选择性的起源。
Intramolecular C-H Insertion Reactions of Iron Carbene Complexes as a General Method for Synthesis of Bicyclo[n.3.0]alkanones
作者:Shingo Ishii、Paul Helquist
DOI:10.1055/s-1997-6122
日期:1997.6
Iron carbene complexes tethered to substituted cycloalkanones undergo intramolecular C-H insertion reactions with alkyl side chains to produce a variety of substituted bicyclo[n.3.0]alkanone derivatives.