Cuppen, Th. J. H. M.; Berendsen, N.; Laarhoven, W. H., Recueil des Travaux Chimiques des Pays-Bas, 1990, vol. 109, # 3, p. 168 - 171
作者:Cuppen, Th. J. H. M.、Berendsen, N.、Laarhoven, W. H.
DOI:——
日期:——
Synthesis and crystal structure of cis-1-benzylidene-1,2,3,4-tetrahydronaphthalene, containing an unexpected conformation of the cyclohexenylidene ring
iridium‐catalyzed asymmetric hydrogenation of unfunctionalized exocyclic C=C bonds was performed by using an axially flexible chiral phosphine–oxazoline ligand, providing the desired chiral 1‐benzyl‐2,3‐dihydro‐1H‐indene products with up to 98 % ee (enantiomeric excess). This represents the first general hydrogenation of unfunctionalized exocyclicolefins with high selectivity reported thus far. The additive
Filling the Gaps in the Challenging Asymmetric Hydrogenation of Exocyclic Benzofused Alkenes with Ir−P,N Catalysts
作者:Maria Biosca、Pol de la Cruz‐Sánchez、Daniel Tarr、Patricia Llanes、Erik A. Karlsson、Jèssica Margalef、Oscar Pàmies、Miquel A. Pericàs、Montserrat Diéguez
DOI:10.1002/adsc.202200870
日期:2023.1.24
system is able to successfully hydrogenate exocyclic olefins bearing a benzofused five- and six-membered ring motif (ee's between 92 to 99%). The catalyst tolerates well the presence of several substituents and substitution patterns at both aromatic rings. The absence of a competing isomerization process together with the perfect fit of the olefins in the catalyst chiral pocket are key to surpass the