Synthesis of Furanomycin Derivatives by Gold-Catalyzed Cycloisomerization of α-Hydroxyallenes
作者:Norbert Krause、Jörg Erdsack
DOI:10.1055/s-2007-990860
日期:2007.12
The novel furanomycin analogues 8 and 17 were synthesized as mixture of two diastereomers using the gold-catalyzed cycloisomerization of α-hydroxyallenes as the key step. Compared to the traditional use of stoichiometric amounts of silver salts, gold catalysis is much more efficient for the cyclization of highly functionalized substrates.
Synthesis of Carbazoles by Gold(I)-Catalyzed Carbocyclization of 2-(Enynyl)indoles
作者:Paramasivan Perumal、Chandrasekaran Praveen
DOI:10.1055/s-0030-1259537
日期:2011.3
carbazoles through gold(I)-catalyzed intramolecular hydroarylation of (Z)-2-(enynyl)indoles was achieved in good yields. The requisite (Z)-2-(enynyl)indoles were synthesized stereoselectively by trimethylgallium-promoted, Z-selective Wittig olefination of N-alkylindole-2-carboxaldehydes with propargyl ylides. Substrates possessing both alkyl as well as aromatic groups are well tolerated under these reaction
Synthesis of Cyclopentenes, Pyrroles, and Thiophenes via a Sequence of Propargyl–Allenyl Isomerizations, Michael Additions, and Intramolecular Wittig Reactions
作者:Guoqing Zhao、Qianyun Zhang、Hongwei Zhou
DOI:10.1021/jo501867h
日期:2014.11.21
simple, readily available propargylphosphonium salts through propargyl–allenyl isomerization. We developed an efficient synthesis for cyclopentenes, pyrroles, and thiophenes via a sequence of propargyl–allenyl isomerizations, Michael additions, and intramolecular Wittig reactions.