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2005
Polyphenylalkene derivatives
Q 0740
P-Chiral 2-{1'-[Butyl(phenyl)phosphanyl]ferrocen-1-yl}-4-isopropyl-4,5-dihyA Second Chirality Center in Catalytic System. — The introduction
37- 094 drooxazoles:
of a second stereogenic center on the phosphorus atom of the parent ligand is carried
out via replacement of the diphenylphosphanyl with the buty(phenyl)phosphanyl
group. The resulting diastereomeric ligands are obtained in enantiomerically pure form
and tested in the Pd-catalyzed allylic substitution reaction of racemic diphenylallyl
acetate (I) with dimethyl malonate (II). The ligand used in the reaction represents the
structure with two central chiralities matching each other while the ligand having opposite configuration at the phosphorus represents a mismatched intermediate. The
catalytic system based on the ligand used provides the highest enantioselectivity. —
(DRAHONOVSKY, D.; STEPNICKA, P.; DVORAK*, D.; Collect. Czech. Chem.
Commun. 70 (2005) 3, 361-369; Dep. Org. Chem., Prague Inst. Chem. Technol.,
CZ-166 28 Prague 6, Czech Republic; Eng.) — H. Hoennerscheid
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