Dialkylaluminum Hydride-Promoted Cyclodimerization of Silylated 1,3-Enynes via Skeletal Rearrangement
摘要:
The dialkylaluminum hydride-promoted reaction of 1-silylalk-3-en-1-ynes gave symmetrical 1,2,3,5-tetrasubstituted benzenes as single regiolsomers. The novel cyclodimerization via skeletal rearrangement can be rationalized by an unprecedented mechanism Involving sequential hydroalumination, alkene isomerization, carboalumination, carbon-carbon bond cleavage, and retro-hydroalumination.
Selective Rhodium-Catalyzed Hydroformylation of Terminal Arylalkynes and Conjugated Enynes to (Poly)enals Enabled by a π-Acceptor Biphosphoramidite Ligand
Microwave-Accelerated Ru-Catalyzed Hydrovinylation of Alkynes and Enynes: A Straightforward Approach toward 1,3-Dienes and 1,3,5-Trienes
作者:Tobias Schabel、Bernd Plietker
DOI:10.1002/chem.201300790
日期:2013.5.27
dirty! Microwave heating was found to have a significant effect on the Ru‐catalyzed hydrovinylations of alkynes. A broad range of different terminal alkynes were coupled to methyl acrylate within just 30 min in good to excellent yields (see scheme). This new protocol was transferred to the hydrovinylation of enynes as novel coupling partners in CH‐activation chemistry giving different 1,3,5‐trienes
<i>Z</i>-Selective (Cross-)Dimerization of Terminal Alkynes Catalyzed by an Iron Complex
作者:Orestes Rivada-Wheelaghan、Subrata Chakraborty、Linda J. W. Shimon、Yehoshoa Ben-David、David Milstein
DOI:10.1002/anie.201601382
日期:2016.6.6
Efficient iron‐catalyzed homocoupling of terminal alkynes and cross‐dimerization of aryl acetylenes with trimethylsilylacetylene is reported. The complex [Fe(H)(BH4)(iPr‐PNP)] (1) catalyzed the (cross‐)dimerization of alkynes at room temperature, with no need for a base or other additives, to give the corresponding dimerized products with Z selectivity in excellent yields (79–99 %).
Microwave irradiated Pd-catalyzed C(sp)–H activation and cross-coupling with styryltrifluoroborates
作者:Mohammad Al-Masum、Wejdan Shaban
DOI:10.1016/j.tetlet.2015.01.107
日期:2015.3
Effective catalytic effect of PdCl2(d(t)bpf) on the C-H activation of alkynes and its ability to overcome the limitations of styryltrifluoroborates in cross-coupling reactions by avoiding the effects of the C-X bond on starting materials is developed. (C) 2015 Elsevier Ltd. All rights reserved.
Selective Rhodium-Catalyzed Hydroformylation of Terminal Arylalkynes and Conjugated Enynes to (Poly)enals Enabled by a π-Acceptor Biphosphoramidite Ligand
The dialkylaluminum hydride-promoted reaction of 1-silylalk-3-en-1-ynes gave symmetrical 1,2,3,5-tetrasubstituted benzenes as single regiolsomers. The novel cyclodimerization via skeletal rearrangement can be rationalized by an unprecedented mechanism Involving sequential hydroalumination, alkene isomerization, carboalumination, carbon-carbon bond cleavage, and retro-hydroalumination.