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2003 Enantioselective syntheses Enantioselective syntheses O 0031 Enantioselective Intramolecular Cyclopropanation of α-Diazo-β-keto Sulfones: Asymmetric Synthesis of Bicyclo[4.1.0]heptanes and Tricyclo[4.4.0.0]decenes. — Cu-Catalyzed decomposition of α-diazo-β-ketone sulfones (I) and (V) in the presence of chiral bisoxazoline ligands results in enantioselective intramolecular cyclopropana- tion to yield the title compounds (II) and (VI), resp., with good stereoselectivity. — (HONMA, M.; NAKADA*, M.; Tetrahedron Lett. 44 (2003) 50, 9007-9011; Dep. Chem., Waseda Univ., Tokyo 169, Japan; Eng.) — Mais 12- 031

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Page 1: Enantioselective Intramolecular Cyclopropanation of α-Diazo-β-keto Sulfones: Asymmetric Synthesis of Bicyclo[4.1.0]heptanes and Tricyclo[4.4.0.0]decenes

2003 Enantioselective syntheses

Enantioselective synthesesO 0031 Enantioselective Intramolecular Cyclopropanation of α-Diazo-β-keto Sulfones:

Asymmetric Synthesis of Bicyclo[4.1.0]heptanes and Tricyclo[4.4.0.0]decenes. — Cu-Catalyzed decomposition of α-diazo-β-ketone sulfones (I) and (V) in the presence of chiral bisoxazoline ligands results in enantioselective intramolecular cyclopropana-tion to yield the title compounds (II) and (VI), resp., with good stereoselectivity. — (HONMA, M.; NAKADA*, M.; Tetrahedron Lett. 44 (2003) 50, 9007-9011; Dep. Chem., Waseda Univ., Tokyo 169, Japan; Eng.) — Mais

12- 031

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