A torquoselective extrusion of isoxazoline N-oxides. Application to the synthesis of aryl vinyl and divinyl ketones for Nazarov cyclization
摘要:
A mild, convenient reaction sequence for the synthesis of Nazarov cyclization substrates is described, The [3+2] dipolar cycloaddition of a nitrone and an electron-deficient alkyne gives all isolable isoxazoline intermediate, which upon oxidation undergoes stereoselectivc extrusion of nitrosomethane to give aryl vinyl or divinyl ketones. (C) 2008 Elsevier Ltd. All right, reserved.
A torquoselective extrusion of isoxazoline N-oxides. Application to the synthesis of aryl vinyl and divinyl ketones for Nazarov cyclization
摘要:
A mild, convenient reaction sequence for the synthesis of Nazarov cyclization substrates is described, The [3+2] dipolar cycloaddition of a nitrone and an electron-deficient alkyne gives all isolable isoxazoline intermediate, which upon oxidation undergoes stereoselectivc extrusion of nitrosomethane to give aryl vinyl or divinyl ketones. (C) 2008 Elsevier Ltd. All right, reserved.