Cu(I)-Catalyzed Synthesis of Furan-Substituted Allenes by Use of Conjugated Ene-yne Ketones as Carbene Precursors
作者:Fangdong Hu、Ying Xia、Chen Ma、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.joc.6b00236
日期:2016.4.15
The synthesis of furan-substituted allenes using conjugated ene-yne ketones as carbene source has been developed. For this reaction, bases play vital roles in controlling the reaction pathways, allowing for access to two types of allene products through trapping of different electrophiles. Mechanistically, the catalytic procedure generated a Cu(I) (2-furyl)carbene intermediate, which is subsequently
Pd-catalyzed cross-coupling of terminal alkynes with ene-yne-ketones: access to conjugated enynes via metal carbene migratory insertion
作者:Ying Xia、Zhen Liu、Rui Ge、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1039/c5cc03559g
日期:——
Pd-catalyzed oxidative cross-coupling of terminal alkynes with ene-yne-ketones has been developed, in which the ene-yne-ketones are served as carbene precursors and metal carbene migratory insertion process is the key step for C–C bond formation.
Palladium-Catalyzed Oxidative Cross-Coupling of Conjugated Enynones with Organoboronic Acids
作者:Ying Xia、Rui Ge、Li Chen、Zhen Liu、Qing Xiao、Yan Zhang、Jianbo Wang
DOI:10.1021/acs.joc.5b01350
日期:2015.8.21
A palladium-catalyzed oxidativecross-coupling reaction of conjugated enynones with organoboronicacids is developed. This reaction provides an efficient methodology for the synthesis of functionalized furan derivatives, including 2-alkenylfurans and furan-substituted 1,3-dienes. Palladium–carbene migratory insertion is proposed as the key step in these transformations. Notably, the β-hydride elimination
Zinc-Catalyzed Synthesis of Conjugated Dienoates through Unusual Cross-Couplings of Zinc Carbenes with Diazo Compounds
作者:Sergio Mata、María J. González、Jesús González、Luis A. López、Rubén Vicente
DOI:10.1002/chem.201604194
日期:2017.1.23
of two carbene sources, such as vinyl diazocompounds and enynones, enabled the synthesis of conjugated dienoate derivatives. This reaction involved the unprecedented coupling of a zinc furyl carbene with vinyl diazocompoundsthrough the γ‐carbon. Alternatively, dienoates were also prepared by a commutative cross‐coupling of zinc vinyl carbenes generated from cyclopropenes and simple diazo compounds
Catching Elusive 2-Furyl Carbenes with Silanes: A Metal-Free Microwave-Assisted Silicon-Hydrogen Bond Functionalization
作者:Silvia González-Pelayo、Luis A. López
DOI:10.1002/adsc.201601037
日期:2016.12.22
An efficient, metal‐free, silicon–hydrogen bond functionalization based on the microwave‐assisted reaction of readily available enynones and silanes is reported. This process seemingly proceeds through a 2‐furyl carbene species, a particularly elusive intermediate. Preliminary studies on the metal‐free oxygen–hydrogen and nitrogen–hydrogen bond functionalization of representative alcohols, azoles and