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...
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.
Well-Defined Air-Stable Palladium HASPO Complexes for Efficient Kumada-Corriu Cross-Couplings of (Hetero)Aryl or Alkenyl Tosylates
作者:Lutz Ackermann、Anant R. Kapdi、Sabine Fenner、Christoph Kornhaaß、Carola Schulzke
DOI:10.1002/chem.201002386
日期:2011.3.1
Palladium complexes of representative heteroatom‐substituted secondary phosphine oxide (HASPO) preligands were synthesized and fully characterized, including X‐ray crystal structure analysis. Importantly, these well‐defined complexes served as highly efficientcatalysts for Kumada–Corriu cross‐couplingreactions of aryl, alkenyl, and even heteroaryl tosylates. Particularly, an air‐stable catalyst derived
代表的钯络合物ħ etero一汤姆取代小号econdary p hoSPhine ø西德(HASPO)preligands合成并充分表征,包括X射线晶体结构分析。重要的是,这些定义明确的络合物可作为Kumada-Corriu芳基,烯基乃至杂芳基甲苯磺酸酯交叉偶联反应的高效催化剂。特别是,由廉价的PinP(O)H衍生的空气稳定型催化剂显示出极高的催化效力,这导致在极低的反应条件下,在足够宽泛的反应条件下,低催化剂负载下的交叉偶联。
A versatile palladium catalyst system for Suzuki–Miyaura coupling of alkenyl tosylates and mesylates
作者:Pui Yu Wong、Wing Kin Chow、Kin Ho Chung、Chau Ming So、Chak Po Lau、Fuk Yee Kwong
DOI:10.1039/c1cc12240a
日期:——
A general and effectivepalladium system for Suzuki-Miyaura coupling of alkenyl electrophiles under mild reaction conditions is reported. With the Pd(OAc)(2)/CM-phos system, a variety of alkenyltosylates are coupled well with ArB(OH)(2). Moreover, the first successful examples of using alkenyl mesylates in alkenylation are also described.
A quick and flexible synthetic approach to enureas (alkenyl ureas) via the Pd-catalyzed C–N coupling reaction of alkenyl tosylates and mesylates
作者:Jignesh P. Dalvadi、Poojan K. Patel、Kishor H. Chikhalia
DOI:10.1039/c3ra44195d
日期:——
As part of our persistent exploration to elucidate the chemistry of Pd-catalyzed CâN coupling, a catalyst system for the coupling reaction of alkenyl tosylates or mesylates with a variety of ureas has been developed. This catalyst system boasts outstanding functional group tolerance and enables the quick synthesis of the entire series of enurea analogs via Pd-catalyzed CâN coupling reactions in excellent yields.