Efficient and selective alkylation of arenes and heteroarenes with benzyl and allyl ethers using a Ir/Sn bimetallic catalyst
作者:Susmita Podder、Sujit Roy
DOI:10.1016/j.tet.2007.06.068
日期:2007.9
A high-valent heterobimetallic catalyst namely [Ir2(COD)2(SnCl3)2(Cl)2(μ-Cl)2] (5 mol %), or dual catalyst system of [Ir(COD)Cl]2 (1 mol %) and SnCl4 (4 mol %), promotes the benzylation or allylation of arenes and heteroarenes using ethers as the alkylating agents. An electrophilic mechanism is proposed from a Hammett correlation.
Multimetallic Ir–Sn3-catalyzed substitution reaction of π-activated alcohols with carbon and heteroatom nucleophiles
作者:Arnab Kumar Maity、Paresh Nath Chatterjee、Sujit Roy
DOI:10.1016/j.tet.2012.10.086
日期:2013.1
An atom economic and catalytic substitutionreaction of π-activated alcohols by a multimetallic Ir–Sn3 complex has been demonstrated. The multimetallic Ir–Sn3 complex can be easily synthesized from the reaction between [Cp∗IrCl2]2 and SnCl2. In presence of as little as 1 mol % of the catalyst three different types of π-activated alcohols, namely benzyl, allyl, and propargyl alcohols, have been successfully
Synthesis of diarylmethanes via a Friedel–Crafts benzylation using arenes and benzyl alcohols in the presence of triphenylphosphine ditriflate
作者:Mohammad Mehdi Khodaei、Ehsan Nazari
DOI:10.1016/j.tetlet.2012.07.051
日期:2012.9
Triphenylphosphine ditriflate (TPPD) was found to be an efficient promoter for the Friedel–Craftsbenzylation of arenes with benzyl alcohols in CH2Cl2 at room temperature. The good yields, the 1:1 molar ratio of arene and benzyl alcohol, the benzylation of chlorobenzene as a nonactivated aromatic compound at room temperature, and no by-product formation are the main advantages of this procedure.
The development of Friedel-Crafts alkylations with alcohols under continuous-flow conditions using heterogeneous catalysts is reported. The reactivities and durabilities of the examined catalysts were systematically investigated, which showed that montmorillonite clay is the best catalyst for these reactions. A high turnover frequency of 9.0 × 102 h-1 was recorded under continuous-flow conditions,
InBr3-Catalyzed Deoxygenation of Carboxylic Acids with a Hydrosilane: Reductive Conversion of Aliphatic or Aromatic Carboxylic Acids to Primary Alcohols or Diphenylmethanes
direct reduction of aliphaticcarboxylicacids with a variety of functional groups to a primaryalcohol using the mild reducing reagent tetramethyldisiloxane (TMDS), in the presence of a catalytic amount of InBr3 has been developed. This simple reducing system, when used together with a hydrosilane, allows the preparation of the diphenylmethane derivative directly from an aromaticcarboxylicacid and