Ruthenium-Catalyzed Transformation of Aryl and Alkenyl Triflates to Halides
摘要:
Aryl triflates were transformed to aryl bromides/iodides simply by treating them with LiBr/NaI and [Cp*Ru(MeCN)(3)]OTf. The ruthenium complex also catalyzed the transformation of alkenyl sulfonates and phosphates to alkenyl halides under mild conditions. Aryl and alkenyl triflates undergo oxidative addition to a ruthenium(II) complex to form eta(1)-arylruthenium and 1-ruthenacyclopropene intermediates, respectively, which are transformed to the corresponding halides.
The First General Palladium Catalyst for the Suzuki−Miyaura and Carbonyl Enolate Coupling of Aryl Arenesulfonates
作者:Hanh Nho Nguyen、Xiaohua Huang、Stephen L. Buchwald
DOI:10.1021/ja036947t
日期:2003.10.1
for the palladium-catalyzed Suzuki-Miyaura and carbonyl enolate coupling of unactivated aryl arenesulfonates was developed utilizing XPhos, 1, and Pd(OAc)2. This is of significant interest because aryl tosylates and aryl benzenesulfonates are more easily handled and considerably less expensive than aryl triflates. This catalyst system effects the coupling of a variety of aryl, heteroaryl, and extremely
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...
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.
Efficient Palladium-Catalysed Enamide Synthesis from Enol Triflates and Enol Tosylates
作者:Michael C. Willis、Gareth N. Brace、Ian P. Holmes
DOI:10.1055/s-2005-918480
日期:——
Catalysts generated from Pd 2 (dba) 3 and biphenyl ligands 4 and 7 efficiently promote the coupling of amides and carbamates with unactivated vinyl triflates and tosylates, to provide enamides in good to excellent yields.