Stereochemical control in the construction of vicinally substituted cyclopentanes and cyclohexanes. Intramolecular conjugate addition of β-ketoester anions.
Stereochemical control in the construction of vicinally substituted cyclopentanes and cyclohexanes. Intramolecular conjugate addition of β-ketoester anions.
esters are versatile intermediates for the synthesis of many biologically active natural products. Here we report a new intramolecular cyclopropanation reaction of unsaturated beta-keto esters. In the presence of I(2), Et(3)N, and Lewis acids such as Mg(ClO(4))(2) and Yb(OTf)(3), beta-keto esters 1 bearing various olefin substituents were transformed to fused cyclopropanes 2 in a highly stereospecific manner
STORK, G.;WINKLER, J. D.;SACCOMANO, N. A., TETRAHEDRON LETT., 1983, 24, N 5, 465-468
作者:STORK, G.、WINKLER, J. D.、SACCOMANO, N. A.
DOI:——
日期:——
Stereochemical control in the construction of vicinally substituted cyclopentanes and cyclohexanes. Intramolecular conjugate addition of β-ketoester anions.
作者:Gilbert Stork、Jeffrey D. Winkler、Nicholas A. Saccomano