Synthesis of cyclopropane containing natural products

Among the most common ligands found on transition metal catalysts are halide ions. Of the commercially available catalysts or pre-catalysts, most are halo-metal complexes. In recent years, manipulation of this metal-halide functionality has revealed that this can be used as a highly valuable method of tuning the reactivity of the complex. Variation of the halide ligand will usually not alter the nature of the system to the extent that it becomes unreactive but will impart sufficiently large changes that differences in reactivity or selectivity occur. These differences are a product of the steric and electronic properties of the halide ligand which has the ability to donate electron density to the metal occurs in a predictable manner. Despite the common perception in asymmetric catalysis that halide ligands are of secondary importance compared to chiral ligands, halide ligands have been found to exert dramatic effects on the enantioselectivity of asymmetric transformations. While the mechanism of action is known for relatively few of the cases, many intriguing and potentially synthetically useful trends are apparent. This review discusses the physical properties of the halides and their effects on stoichiometric and catalytic transition metal processes. The metal-halide moiety thus emerges as a tunable functionality on the transition metal catalyst that can be used in the development of new catalytic systems.

Halide effects in transition metal catalysis.

Die Halogenidionen zahlen zu den gelaufigsten Liganden bei der Ubergangsmetallkatalyse. Die meisten der kauflich erhaltlichen Katalysatoren oder Vorstufen von Katalysatoren sind Halogen-Metall-Komplexe. In den letzten Jahren stellte sich heraus, dass man mit der Veranderung dieser Metall-Halogenid-Funktion eine sehr wertvolle Methode zur genauen Einstellung der Reaktivitat des Komplexes zur Verfugung hat. Ein anderer Halogenidligand fuhrt zwar gewohnlich nicht zu einem Erloschen der Reaktivitat des Systems, die Anderungen sind aber hinreichend gros, dass man eine unterschiedliche Reaktivitat oder Selektivitat erhalt. Diese Unterschiede resultieren aus den sterischen und elektronischen Eigenschaften des Halogenidliganden, der Elektronendichte auf vorhersagbare Weise auf das Metallzentrum ubertragen kann. Entgegen der ublichen Annahme, dass die Bedeutung der Halogenidliganden fur die asymmetrische Katalyse im Vergleich zu der der chiralen Liganden zweitrangig sei, fand man, dass Halogenidliganden die Enantioselektivitat asymmetrischer Umwandlungen erheblich beeinflussen. Den Wirkungsmechanismus kennt man nur in verhaltnismasig wenigen Fallen, doch viele faszinierende und praparativ moglicherweise nutzliche Trends sind augenfallig. Dieser Aufsatz befasst sich mit den physikalischen Eigenschaften der Halogenide und deren Einfluss auf stochiometrische und katalytische Prozesse mit Ubergangsmetallen. Dabei erweist sich die Metall-Halogenid-Einheit als eine einstellbare Funktionalitat am Ubergangsmetallkatalysator, mit der man neue katalytische Systeme entwickeln kann.

Der Einfluss von Halogenidionen in der Übergangsmetallkatalyse

Rhodium-catalysed asymmetric ring opening reactions with carboxylate nucleophiles

The intramolecular SN′ reaction

Facile synthesis of vinylic cyclopropanes carboxylates with Bis [ethylene gis(diphenylphosphine)] palladium (0) as catalyst

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Facile synthesis of vinylic cyclopropanes carboxylates with Bis [ethylene gis(diphenylphosphine)] palladium (0) as catalyst