Copper-Catalyzed Regioselective and Stereoselective Coupling of Grignard Reagents with Pent-1-en-4-yn-3-yl Benzoates: A Shortcut to (<i>Z</i>)<i>-</i>1,5-Disubstituted Pent-3-en-1-ynes from Accessible Starting Materials
Copper-catalyzed coupling of Grignardreagents with pent-1-en-4-yn-3-yl benzoates occurs regioselectively at the terminal alkenyl carbon rather than the alkynyl site, leading to the stereoselective formation of unexpected (Z)-1,5-disubstituted pent-3-en-1-ynes without generation of the initially expected alkenyl allene products. By using easily accessible starting materials, this reaction can provide
Skeletal change in the PNP pincer ligand leads to a highly regioselective alkyne dimerization catalyst
作者:Wei Weng、Chengyun Guo、Remle Çelenligil-Çetin、Bruce M. Foxman、Oleg V. Ozerov
DOI:10.1039/b511148j
日期:——
A Rh complex of a bulky diarylamino-based PNP pincer ligand is a robust catalyst for the dimerization of terminal alkynes and highly selective for the trans-enyne product.
Enyne Chlorides: Substrates for Copper-Catalyzed Asymmetric Allylic Alkylation
作者:Hailing Li、Alexandre Alexakis
DOI:10.1002/anie.201107129
日期:2012.1.23
A select few: Several prochiral enynechlorides were employed as substrates in the title reaction using Grignard reagents as the alkylation reagents (see scheme; CuTC=copper(I) thiophenecarboxylate). Excellent 1,3 substitution regioselectivities and good to excellent enantioselectivities were obtained. The substrate scope is additionally extended to diene chlorides.