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Highly Enantioselective Copper-Catalyzed Conjugate Addition of Diethylzinc to Enones Using Chiral Spiro Phosphoramidites as Ligands

✍ Scribed by Zhou, Hai; Wang, Wen-Hu; Fu, Yu; Xie, Jian-Hua; Shi, Wen-Jian; Wang, Li-Xin; Zhou, Qi-Lin

Book ID: 127277871
Publisher: American Chemical Society
Year: 2003
Tongue: English
Weight: 56 KB
Volume: 68
Category: Article
ISSN: 0022-3263
DOI: 10.1021/jo026611m

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## Abstract New amino acid‐based modular chiral ligands were readily synthesized and used to catalyze the asymmetric conjugate addition of Et~2~Zn to various cyclic enones in the presence of a variety of copper sources. Moderately high __ee__ of up to 72% were obtained using ligand (__S__)‐**1e** u