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- W2124675042 abstract "We describe the application of a new class of ligands –the phosphite-oxazole/imidazole (L1–L5a–g) – in asymmetric intermolecular Pd-catalyzed Heck reactions under thermal and microwave conditions. These ligands combine the advantages of the oxazole/imidazole moiety with those of the phosphite moiety: they are more stable than their oxazoline counterparts, less sensitive to air and other oxidizing agents than phosphines and phosphinites, and easy to synthesize from readily available alcohols. The results indicate that activities, regio- and enantioselectivities, are highly influenced by the type of nitrogen donor group (oxazole or imidazole), the oxazole and biaryl-phosphite substituents and the axial chirality of the biaryl moiety of the ligand. By carefully selecting the ligand components, we achieved high activities, regio- (up to 99%) and enantioselectivities (up to 99%) using several triflate sources. Under microwave-irradiation conditions, reaction times were considerably shorter (from 24 h to 30 min) and regio- and enantioselectivities were still excellent." @default.
- W2124675042 created "2016-06-24" @default.
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- W2124675042 date "2011-01-01" @default.
- W2124675042 modified "2023-10-18" @default.
- W2124675042 title "Phosphite-oxazole/imidazoleligands in asymmetric intermolecular Heck reaction" @default.
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- W2124675042 doi "https://doi.org/10.1039/c0ob00656d" @default.
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