Diastereocontrol in Asymmetric Allyl–Allyl Cross-Coupling: Stereocontrolled Reaction of Prochiral Allylboronates with Prochiral Allyl Chlorides
摘要:
Palladium-catalyzed allyl-ally cross-coupling was investigated with substituted prochiral allylic boronates. These reactions deliver products bearing adjacent stereocenters, and the issue of diastereocontrol is therefore paramount. Under appropriately modified conditions, this allyl allyl coupling strategy was found to apply to a range of substrates, generally occurring with high enantioselectivity (92:8 to >99:1 er) and good diastereoselection (4:1 to 14:1 dr).
Oxidation of olefins to ketones in combination with electrooxidation
作者:Jiro Tsuji、Makoto Minato
DOI:10.1016/s0040-4039(00)96354-8
日期:1987.1
In combination with anodic oxidation, 1-alkenes are oxidized to methyl ketones efficiently by the catalyses of Pd(OAc)2 and benzoquinone. Cyclopentene and Cyclohexene are oxidized smoothly to the corresponding ketones in high yields.
Synthesis of (±)-dimethyl curvularin based on the palladium-catalyzed carbonylation of 3,5-dimethoxybenzyl chloride using a butadiene telomer as a building block
作者:Takashi Takahashi、Hiroshi Ikeda、Jiro Tsuji
DOI:10.1016/0040-4039(80)80207-3
日期:1980.1
afforded benzyl 7-(3,5-dimethoxyphenylacetoxy)octanoate (6) in 70% yield, which is the precursor of Curvularin (4). The ester (12) was easily prepared from the butadienetelomer obtained by the palladium-catalyzed reaction of butadiene with acetic acid.
Preparation of 1-Alkenes by the Palladium-Catalyzed Hydrogenolysis of Terminal Allylic Carbonates and Acetates with Formic Acid-Triethylamine
作者:Jiro Tsuji、Ichiro Minami、Isao Shimizu
DOI:10.1055/s-1986-31723
日期:——
A useful method for the preparations of 1-alkenes from terminal allylic carbonates and acetates by the palladium-catalyzed reaction with formates is described. Formic acid-triethylamine is a suitable reductant. As catalyst, Pd2(dba)3CHCl3-P(n-Bu)3, gave the best results. 0.05 0.2mol% being sufficient (turnover 500 2000). Using this method, various 1-alkenes were prepared in good yields with high selectivity.
Total synthesis of lipoxin A4 and lipoxin B4 from butadiene
作者:A Rodrı́guez、M Nomen、B.W Spur、J.J Godfroid、T.H Lee
DOI:10.1016/s0040-4039(99)02201-7
日期:2000.2
The total synthesis of LXA4 and LXB4 has been achieved starting from butadiene via palladium catalyzed telomerization. Sharpless catalytic AE and C-2 inversion of the 2(S),3(S)-epoxy alcohols, using Myers CO2/Cs2CO3 procedure, generated the asymmetric centers. The flexibility of the strategy allows an easy access to the linear eicosanoids.
LXA 4和LXB 4的总合成已从丁二烯开始,经钯催化的端粒化反应完成。使用Myers CO 2 / Cs 2 CO 3程序对2(S),3(S)-环氧醇进行无尖锐催化AE和C-2转化,生成不对称中心。该策略的灵活性允许轻松访问线性类花生酸。
Method of producing highly unsaturated compounds by reacting
申请人:Mitsubishi Chemical Industries Ltd.
公开号:US03981907A1
公开(公告)日:1976-09-21
A 1,3-conjugated diene compound and a derivative of a butadiene dimer are subjected to an addition reaction over a rhodium compound. The 1,3-conjugated diene compound adds to the derivative in a molar ratio of 1:1. The derivative may be an ester, ether or alcohol. Said derivative is obtained either by reacting a carboxylic acid, an alcohol or a phenol with a butadiene over a palladium catalyst or by hydrolyzing the reaction product.