Palladium-catalysed mono-α-alkenylation of ketones with alkenyl tosylates
作者:Yong Wu、Wai Chung Fu、Chien-Wei Chiang、Pui Ying Choy、Fuk Yee Kwong、Aiwen Lei
DOI:10.1039/c6cc08392g
日期:——
The first example of palladium-catalysed selective mono-[small alpha]-alkenylation of ketones with alkenyl tosylates is described. In the presence of Pd/XPhos catalyst system (0.1-1.0 mol%), the reaction provides mono--alkenylated of ketones in...
Palladium-Catalyzed α-Vinylation of Carbonyl Compounds
作者:Jinkun Huang、Emilio Bunel、Margaret M. Faul
DOI:10.1021/ol7019839
日期:2007.10.1
A mild, general, catalytic system for the alpha-vinylation of carbonyl compounds has been developed. By employing [Pd(P(t)Bu(3))Br](2) as catalyst and LHMDS as base, vinyl bromides, vinyl triflates, and vinyl tosylates couple with 3-methyloxindole in satisfactory yields. The same catalytic system is extended to the alpha-vinylation of ketones and esters.
Cross-Coupling of Phenol Derivatives with Umpolung Aldehydes Catalyzed by Nickel
作者:Leiyang Lv、Dianhu Zhu、Jianting Tang、Zihang Qiu、Chen-Chen Li、Jian Gao、Chao-Jun Li
DOI:10.1021/acscatal.8b01224
日期:2018.5.4
cross-coupling to construct the C(sp2)–C(sp3) bond was developed from two sustainable biomass-based feedstocks: phenolderivatives with umpolung aldehydes. This strategy features the in situ generation of moisture/air-stable hydrazones from naturally abundant aldehydes, which act as alkyl nucleophiles under catalysis to couple with readily available phenolderivatives. The avoidance of using both halides
The general coupling of amine/ether C(sp3)–H bonds with alkenyl/(hetero)aryl C–O electrophiles is reported with high selectivity.
氨基/醚C(sp3)-H键与烯基/(杂)芳基C-O亲电试剂的普遍偶联反应报道了高选择性。
Catalytic Direct C2-Alkenylation of Oxazoles at Parts per Million Levels of Palladium/PhMezole-Phos Complex
作者:Wai Chung Fu、Yong Wu、Chau Ming So、Shun Man Wong、Aiwen Lei、Fuk Yee Kwong
DOI:10.1021/acs.orglett.6b02619
日期:2016.10.21
ligand candidate to facilitate this reaction. Significantly, the method is scalable and exhibits excellent substrate tolerance. Highlystericallyhindered substrates and small vinyl tosylate can be coupled successfully. Moreover, our method enables a rapid diversification of oxazole-based C^N ligands which can be readily derived into new group 9 organometallic compounds.