Mild Friedel–Crafts Reactions inside a Hexameric Resorcinarene Capsule: C−Cl Bond Activation through Hydrogen Bonding to Bridging Water Molecules
作者:Pellegrino La Manna、Carmen Talotta、Giuseppe Floresta、Margherita De Rosa、Annunziata Soriente、Antonio Rescifina、Carmine Gaeta、Placido Neri
DOI:10.1002/anie.201801642
日期:2018.5.4
Calculations showed that there are catalytically relevant hydrogen‐bonding interactions between the bridging water molecules of the capsule and benzyl chloride, which is fundamental for the activation of the C−Cl bond. The capsule controls the reaction outcome. Inside the inner cavity of the capsule, N‐methylpyrrole is preferentially benzylated in the unusual β‐position while mesitylene reacts faster than 1
palladium‐catalyzed enantioselectiveCHfunctionalization of indoles was achieved with an axiallychiral2,2′‐bipyridine ligand, thus providing the desired indol‐3‐acetate derivatives with up to 98 % ee. Moreover, the reaction protocol was also effective for asymmetric OH insertion reaction of phenols using α‐aryl‐α‐diazoacetates. This represents the first successful application of bipyridine ligands with axial
轴向手性的2,2'-联吡啶配体实现了钯催化对映体的C C H的对映选择性CH官能化,从而提供了所需的吲哚-3-乙酸酯衍生物,其ee高达98%。此外,该反应方案对于使用α-芳基-α-重氮乙酸酯的酚的不对称OH插入反应也有效。这代表具有轴向手性的联吡啶配体在钯催化的卡宾迁移插入反应中的首次成功应用。
Indol-2-yltributylstannane: A Versatile Reagent for 2-Substituted Indoles
作者:Sharada S. Labadie、Edmond Teng
DOI:10.1021/jo00094a042
日期:1994.7
A general method for 2-substituted indoles via the palladium-catalyzed coupling of indol-2-ylstannanes is described. (N-Methylindol-2-yl)tributylstannane (1) reacts with a variety of electrophiles under very mild conditions: [N-tert-Butoxycarbonyl)indol-2-yl]tributylstannane (3) is much less reactive in the coupling reactions and reacts only with certain activated electrophiles. [N-[[(Trimethylsilyl)ethoxy]methylindol-2-yl]tributylstannane (4) behaves similarly to 1 and the removal of the [(trimethylsilyl)ethoxy]methyl group can be achieved with tetra-n-butylammonium fluoride in DMF in the presence of ethylenediamine.
Platinum-Catalyzed Formation of Cyclic-Ketone-Fused Indoles fromN-(2-Alkynylphenyl)lactams
作者:Guotao Li、Xiaogen Huang、Liming Zhang
DOI:10.1002/anie.200702931
日期:2008.1
Studies in the Indole Series. I. The Synthesis of Alpha-Benzylindoles