| Autor: |
Stará, Irena G., Andronova, Angelina, kollárovič, Adrian, Vyskočil, Štěpán, Jugé, Sylvain, Lloyd-Jones, Guy C., Guirye, Patrick J., Starý, Ivo |
| Předmět: |
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| Zdroj: |
Collection of Czechoslovak Chemical Communications; 2011, Vol. 76 Issue 12, p2005-2022, 18p, 3 Diagrams, 4 Charts |
| Abstrakt: |
The enantioselective [2+2+2] cycloisomerisation of the aromatic triynes under nickel(0) catalysis to afford nonracemic [6]- and [7]helicene derivatives has been systematically studied. A collection of mono- and bidentate phosphines, phosphites, phosphinites and phosphinous amides possessing stereogenic units such as chiral centre, axis or plane (or their combinations) has been tested and axially chiral binaphthyl-derived monodentate MOP-type phosphine ligands were the optimal class of ligands. Nickel complexes of these ligands afforded nonracemic tetrahydro[6]helicene in up to 64% ee in a model reaction. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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