报道了合成邻苯二甲酸盐和γ-丁内酯的简便策略。该方法在正式的Au(I)和Pd(II)催化的S N 2'反应中利用易于制备的烯丙醇。使用这些催化剂,观察到所需五元内酯的排他形成,完全避免了竞争的直接内酯化途径,后者与质子酸和其他金属盐形成了不希望的七元环。这种温和且操作简单的方法尤其可以耐受环乙亚甲基,应在邻苯二甲酸酯和萜烯合成中找到用途。
Synthesis of isocoumarins via thallation-olefination of benzoic acids
作者:R. C. Larock、S. Varaprath、H. H. Lau、C. A. Fellows
DOI:10.1021/ja00330a041
日期:1984.9
Par thallation de l'acide benzoique puis alcenylation en presence de PdCl 2 du carboxy-2 phenyl bis-trifluoroacetoxy thallium obtenu, on prepare diverses isocoumarines et dihydro-3,4 isocoumarines
在 PdCl 2 du carboxy-2 苯基双-三氟乙酰氧基铊 obtenu 存在下进行部分 thallation de l'acide benzoique puis alcenylation,制备不同的异香豆素和二氢-3,4 异香豆素
Overcoming the Deallylation Problem: Palladium(II)-Catalyzed Chemo-, Regio-, and Stereoselective Allylic Oxidation of Aryl Allyl Ether, Amine, and Amino Acids
作者:Kartic Manna、Hasina Mamataj Begam、Krishanu Samanta、Ranjan Jana
DOI:10.1021/acs.orglett.0c02465
日期:2020.10.2
We report herein a Pd(II)/bis-sulfoxide-catalyzed intramolecular allylic C–H acetoxylation of aryl allyl ether, amine, and amino acids with the retention of a labile allyl moiety. Mechanistically, the reaction proceeds through a distinct double-bond isomerization from the allylic to the vinylic position followed by intramolecular carboxypalladation and the β-hydride elimination pathway. For the first
Iridium‐Catalyzed Cycloisomerization of Alkynoic Acids: Synthesis of Unsaturated Lactones
作者:Yi Huang、Xianghe Zhang、Xiu‐Qin Dong、Xumu Zhang
DOI:10.1002/adsc.201901322
日期:2020.2.21
The iridium‐catalyzed cycloisomerization of various alkynoic acids was successfully developed, and a series of five‐, six‐, and especially seven‐membered unsaturated lactones were constructed with moderate yields and excellent regioselectivities (up to 68% yield, >99:1 rr). In addition, the indole compound can be easily prepared with 75% yield through this efficient synthetic methodology. Moreover