Alkyl(carbazol-9-yl)(benzotriazol-1-yl)methanes are deprotonated by BuLi to form anions which react with alkyl halides, aldehydes, and isocyanates to afford the expected products and which add 1,4 to alpha,beta-unsaturated ketones. These products are hydrolyzed by dilute acid at ambient temperature to afford the corresponding ketones.
Stereoselective Preparation of (<i>Z</i>)-γ-Silyl-γ,δ-Unsaturated Ketones and their Application in the Synthesis of 1,4-Diketones
作者:Xian Huang、Weixin Zheng
DOI:10.1055/s-2002-35624
日期:——
Hydrozirconation reaction of alkynylsilanes I followed by Michael addition to α,β-unsaturatedketones in the presence of CuBr.Me 2 S complex produced (Z)-γ-silyl-γ,δ-unsaturated ketones 3 stereoselectively. 1,4-Diketones were prepared via epoxidation and hydrolysis of 3.
在 CuBr.Me 2 S 配合物的存在下,炔基硅烷 I 与 α,β-不饱和酮发生迈克尔加成反应后,产生立体选择性的 (Z)-γ-甲硅烷基-γ,δ-不饱和酮 3。1,4-二酮通过3的环氧化和水解制备。
Pd(0)-Catalyzed Conjugate Addition of Benzylzinc Chlorides to α,β-Enones in an Atmosphere of Carbon Monoxide: Preparation of 1,4-Diketones
作者:Motoki Yuguchi、Masao Tokuda、Kazuhiko Orito
DOI:10.1021/jo035468+
日期:2004.2.1
Pd(0)-catalyzed conjugate addition of benzylzinc chloride to methyl vinyl ketone in the presence of chlorotrimethylsilane and lithium chloride in an atmosphere of carbon monoxide at room temperature afforded 1-phenyl-2,5-hexanedione monosilyl enol ether. In this catalytic carbonylation, four components are connected in one reaction. Successive acidic workup generated a variety of 1,4-diketones from