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ChemInform Abstract: Enantioselective Copper-Catalyzed 1,4-Addition of Organozinc Reagents to Enones Using Chiral Oxazoline-Phosphite Ligands.

✍ Scribed by A. K. H. KNOEBEL; I. H. ESCHER; A. PFALTZ

Publisher
John Wiley and Sons
Year
2010
Weight
36 KB
Volume
29
Category
Article
ISSN
0931-7597

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✦ Synopsis

Enantioselective Copper-Catalyzed 1,4-Addition of Organozinc Reagents to Enones Using Chiral Oxazoline-Phosphite Ligands.

-The enantioselective 1,4-addition of organozinc reagents to Ξ±,Ξ²-unsaturated ketones in the presence of chiral P,N-ligands (I) with a binaphthyl phosphite group and an oxazoline ring as coordinating units are investigated. Cyclic ketones such as cyclohexenone (II) give moderate to good enantioselectivities, whereas the acyclic ketones (V) give low stereoselectivities. In most cases, the methylated derivative (Ia) is found to be more effective than (Ib). -(KNOEBEL, A.

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