Caesium fluoride-promoted Stille coupling reaction: an efficient synthesis of 9Z-retinoic acid and its analogues using a practical building block
作者:Takashi Okitsu、Kinya Iwatsuka、Akimori Wada
DOI:10.1039/b813760a
日期:——
A highly efficient and rapid total synthesis of 9Z-retinoic acid was accomplished by caesium fluoride-promoted Stille coupling reaction; using a common building block, 9Z-retinoic acid analogues were also prepared by the same method without isomerisation of the Z-double bond.
Chiral ligands and their transition metal complexes
申请人:Scholz Ulrich
公开号:US20070066825A1
公开(公告)日:2007-03-22
The present invention relates to chiral phosphorus compounds and their transition metal complexes, and also to the use of these transition metal complexes, especially in asymmetric syntheses.
complexes are easily synthesized by palladium-catalyzed C−P cross-coupling of vinyltriflates with secondary phosphine−boranes. This method allows the synthesis of phosphine derivatives not always easily accessible by other approaches. The vinylphosphine derivatives are purified by chromatography on silica gel. The versatility of the method is proved by using various triflates and diaryl-, dialkyl- and al
New Applications of Camphor-Derived P,N-Ligands for Asymmetric Pd- and Ir-Catalyzed Reactions
作者:Martine Bonin、Laurent Micouin、Paul Knochel、Tanasri Bunlaksananusorn、Alejandro Pérez Luna
DOI:10.1055/s-2003-42067
日期:——
Ir-catalyzedasymmetric hydroboration of bicyclic hydrazine 4 in the presence of chiral ligand la, leads to bicyclic alcohol 5 after oxidative workup in good yield (76%) and moderate enantioselectivity (71 % ee).
Rapid Access to Multisubstituted Acrylamides from Cyclic Ketones via Palladium/Norbornene Cooperative Catalysis
作者:Zhao Wu、Guangbin Dong
DOI:10.1002/anie.202201239
日期:2022.4.19
A palladium/norbornene-catalyzed vicinal difunctionalization of enol triflates has been developed for rapid, modular and regioselective synthesis of multisubstituted acrylamides from simple ketones. The reaction exhibits broad functional group tolerance, and the use of bulky secondary amide-derived norbornenes appears to be a key parameter to maintain high efficiency and selectivity.