Heterocycles by PtCl<sub>2</sub>-Catalyzed Intramolecular Carboalkoxylation or Carboamination of Alkynes
作者:Alois Fürstner、Paul W. Davies
DOI:10.1021/ja055659p
日期:2005.11.1
carboalkoxylation, hydroamination, and carboamination reactions of alkynes, effecting the formation of substituted benzo[b]furan, indole-, and isochromene-1-one derivatives, respectively. This procedure allows for the transfer of (substituted) allyl, methoxymethyl (MOM), benzyloxymethyl (BOM), and (trimethylsilyl)ethoxymethyl (SEM) groups from oxygen to carbon and is compatible with functional groups
PtCl2 是炔烃分子内加氢烷氧基化、碳烷氧基化、加氢胺化和氨基化反应的方便催化剂,分别影响取代的苯并[b]呋喃、吲哚-和异色烯-1-酮衍生物的形成。此过程允许(取代的)烯丙基、甲氧基甲基 (MOM)、苄氧基甲基 (BOM) 和(三甲基甲硅烷基)乙氧基甲基 (SEM) 基团从氧转移到碳,并且与易于氧化插入低价的官能团相容以前用于类似目的的金属种类。尽管某些反应甚至可以在空气中进行,但在 CO 气氛下进行时反应速率会显着增加。 提出了一个机械原理,
Dual Photoredox/Gold Catalysis Arylative Cyclization of <i>o</i>-Alkynylphenols with Aryldiazonium Salts: A Flexible Synthesis of Benzofurans
A new method for the arylative cyclization of o-alkynylphenols with aryldiazonium salts via dual photoredox/gold catalysis is described. The reaction proceeds smoothly at roomtemperature in the absence of base and/or additives and offers an efficient approach to benzofuran derivatives. The scope of the transformation is wide, and the limitations are discussed. The reaction is proposed to proceed through
The olefin isomerization/enantioselective intramolecular Alder-ene reaction cascade was achieved by using a cationic rhodium(I)/(R)-BINAP complex as a catalyst. A variety of substituted dihydrobenzofurans and dihydronaphthofurans were obtained from phenol- or naphthol-linked 1,7-enynes, respectively, with good yields and ee values.
Yoneda, Eiji; Sugioka, Takashi; Hirao, Kojiro, Journal of the Chemical Society. Perkin transactions I, 1998, # 3, p. 477 - 483