1,2-双(二苯基膦)乙烷(DPPE)是过渡金属催化剂中用途广泛且极其重要的配体。在这里,我们报道了容易获得的丙二烯基乙酸酯的二硫代膦酰化,以高产率和区域选择性生成 DPPE。该方案具有广泛的底物范围和温和的条件,避免使用过渡金属和空气敏感的磷源。机理研究表明该反应是通过 S N 2' 型加成-消除反应和 1,4-加成步骤完成的。
Efficient Synthesis of 3-Chloromethyl-2(5<i>H</i>)-furanones and 3-Chloromethyl- 5,6-dihydropyran-2-ones via the PdCl<sub>2</sub>-Catalyzed Chlorocyclocarbonylation of 2,3- or 3,4-Allenols
作者:Xin Cheng、Xuefeng Jiang、Yihua Yu、Shengming Ma
DOI:10.1021/jo8015677
日期:2008.11.21
was formed between the center carbon atom of the allene moiety and the hydroxyl oxygen, which was established by the X-ray single crystal diffraction study of gamma-lactone 3p. The highly opticallyactive 3-chloromethyl-2(5H)-furanones could be easily prepared from the readily available opticallyactive 2,3-allenols. A mechanism for this reaction was proposed.
The first facile and efficient acid-catalyzed direct coupling of a wide range of unprotected 2,3-allenols with arylphosphine oxides was developed, offering a general, one-step approach for the synthesis of structurally diverse γ-ketophosphine oxides accompanied by concurrent C—P/C═Obondformation with remarkable functional group tolerance and complete atom-economy under metal- and additive-free conditions
开发了第一个简便而有效的酸催化的直接方法,将多种未保护的2,3-烯醇与芳基膦氧化物直接偶联,为合成结构多样的γ-酮膦氧化物同时存在C- P /C═O键的形成具有出色的官能团耐受性,并且在无金属和无添加剂的条件下具有完整的原子经济性。机理研究表明,这种转化涉及重排和磷-迈克尔反应。
C−C-Bond Formation by the Palladium-Catalyzed Cycloisomerization/Dimerization of Terminal Allenyl Ketones: Selectivity and Mechanistic Aspects
作者:A. Stephen K. Hashmi、Thorsten L. Ruppert、Thomas Knöfel、Jan W. Bats
DOI:10.1021/jo970837l
日期:1997.10.1
conditions, besides the normal functional group tolerance known for palladium-catalyzed reactions, an interesting selectivity was observed with functional groups that are known to react either in palladium-catalyzed reactions or reactions catalyzed by other transition-metals. Thus aryl halides, terminal alkynes, 1,6-enynes, and alpha-allenic alcohols were tolerated. In the latter example the selective reaction
Simple and Efficient Synthesis of α-Allenic Alcohols and Their Novel Conversion into 1-Aryl-3-formyloxy-1,3-butadienes
作者:Masahiko Iyoda、Yoshiaki Kanao、Minoru Nishizaki、Masaji Oda
DOI:10.1246/bcsj.62.3380
日期:1989.10
Reactions of carbonyl compounds with 3-bromo-1-propyne in the presence of SnCl2·2H2O and LiI·3H2O gave α-allenic alcohols in moderate yields together with small amounts of β-acetylenic alcohols. The α-allenic alcohols can be converted into 1-aryl-3-formyloxy 1,3-butadienes, novel 1,3-butadiene derivatives.
The first facile, efficient, atom-economical and regioselective palladium-catalyzed direct C–P cross-coupling of unprotected allenic alcohols with H-phosphonates for the one-pot synthesis of structurally diverse multisubstituted 2-phosphinoyl-1,3-butadienes was developed. This strategy would enrich the allene chemistry and afford new scaffolds to construct complex molecular skeletons.