Palladium-Catalyzed Intermolecular Ditrifluoromethoxylation of Unactivated Alkenes: CF<sub>3</sub>O-Palladation Initiated by Pd(IV)
作者:Chaohuang Chen、Yixin Luo、Liang Fu、Pinhong Chen、Yu Lan、Guosheng Liu
DOI:10.1021/jacs.7b11470
日期:2018.1.31
A novel palladium-catalyzedintermolecular ditrifluoromethoxylation of unactivatedalkenes has been developed, using a new electrophilic reagent, SelectfluorCN, as a strong oxidant, and AgOCF3 as a trifluoromethoxide source. Preliminary mechanistic studies revealed that the reaction was possibly initiated by Pd(IV) species, and an unusual cis-addition of CF3O-Pd(IV) into the double bond leads to the
Preparation of polycyclic compounds by intramolecular photospirocyclization and photocycloaddition reactions of 4-alkenyl-1-cyanonaphthalene derivatives
Photoreactions of 5-phenyl derivatives produce a product having tricyclo[6.3.0.01,4]undecadiene skeleton. Formation of angulartriquinanes takes place in photoreactions of cycloalkene-linked cyanonaphthalenes. The observation demonstrates that π–π arene ring interactions, steric hindrance, and suitable locations of reaction sites in syn and anti singlet exciplexes govern the modes followed in intramolecular photoreactions
A method for performing an iron-catalyzed allylic alkylation includes the preparation of a reaction mixture obtainable from (i) an allylic substrate with the structural element C═C—C—X, wherein X comprises a leaving group that represents a carbonate, (ii) an active Fe(-II) catalyst complex, (iii) at least one ligand, (iv) at least one solvent, and (v) a nucleophile or pronucleophile.
Enantioselective Nickel-Catalyzed Reductive Aryl/Alkenyl–Cyano Cyclization Coupling to All-Carbon Quaternary Stereocenters
作者:Zi-Hao Chen、Rui-Ze Sun、Fei Yao、Xu-Dong Hu、Long-Xue Xiang、Hengjiang Cong、Wen-Bo Liu
DOI:10.1021/jacs.2c01237
日期:2022.3.23
An enantioselective nickel-catalyzed intramolecular reductive cross-coupling of C(sp2) electrophiles and cyano groups is reported. Enantioenriched CN-containing all-carbonquaternarystereocenters are assembled by desymmetrizing cyclization of aryl/alkenyl halide-tethered malononitriles. The use of an organic reductant, (EtO)2MeSiH, is crucial to the enantioselectivity and reactivity. Applications
Etude de la regioselectivite de la substitution des carbanions par des derives allyliques catalysee au palladium. Obtention selective de composes a carbone quaternaire
作者:Thérèse Cuvigny、Marc Julia、C. Rolando
DOI:10.1016/0022-328x(85)87384-8
日期:1985.4
carbanions and ligands on π-allylpalladium has been investigated in the substitution of primary or tertiary terpene derivatives. Conditions have been found under which the substitution takes place essentially at one or the other end of the allylic system. This provides a new and convenient way to obtain compounds with quaternary carbonatoms, which has been exemplified by the synthesis of 3,3-dimethyl-4-pentenenitrile