Controlled Reactivity of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) in the Selective Synthesis of 1-(Bromoethynyl)arenes
作者:Shiva Krishna Moodapelly、Gangavaram V. M. Sharma、Venkata Ramana Doddi
DOI:10.1002/adsc.201601279
日期:2017.5.2
1‐(bromoethynyl)arenes from 1,1‐dibromoalkenes. Differential reactivity of DBU in protic solvents as compared to aprotic solvents has been explored to prevent the formation of mixtures of products in this reaction. Hydrated DBU is found to be superior to dry DBU, both for the selective synthesis and ease of isolation. In addition, use of DBU⋅H2O as a non‐nucleophilic mild base allowed us to synthesise 1‐
Rhodium(III)‐Catalyzed Synthesis of Skipped Enynes via C(sp
<sup>3</sup>
)–H Alkynylation of Terminal Alkenes
作者:Franco Della‐Felice、Margherita Zanini、Xiaoming Jie、Eric Tan、Antonio M. Echavarren
DOI:10.1002/anie.202014877
日期:2021.3.8
The RhIII‐catalyzedallylicC−H alkynylation of non‐activated terminalalkenes leads selectively to linear 1,4‐enynes at room‐temperature. The catalytic system tolerates a wide range of functional groups without competing functionalization at other positions. Similarly, the vinylic C−H alkynylation of α,β‐ and β,γ‐ unsaturated amides gives conjugated Z‐1,3‐enynes and E‐enediynes.
作者:Alexey V. Shastin、Vasily N. Korotchenko、Valentine G. Nenajdenko、Elisabeth S. Balenkova
DOI:10.1055/s-2001-18055
日期:——
A new simple and efficient transformation of aromatic aldehydes to β,β-dibromostyrenes and arylbromoacetylenes is described. The olefination procedure was conducted under mild conditions and in good yields.
New Zirconium-Mediated Approach Toward Regio- and Stereocontrolled Synthesis of <i>trans</i>-Enediynes
作者:Yuanhong Liu、Hongjun Gao
DOI:10.1021/ol052706+
日期:2006.1.1
reactions of alpha-alkynylated zirconacyclopentene based on 1,4-bis(trimethylsilyl)-1,3-butadiyne with unsaturated compounds are described, which provide an efficient, regio- and stereocontrollable synthesis of trans-enediynes in a one-pot procedure. An interesting alkynyl group shift from alpha- to beta-position of the zirconium center during the reaction was observed, which was accountable for the novel