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- W2953171011 abstract "Cycloaddition of diazomethane and ethyl diazoacetate to α-(diethoxyphosphoryl)vinyl p-tolyl sulfoxide 1a and its β-substituted analogues (Me, Ph) results in the formation of 3-phosphoryl-pyrazoles in high yield. The reaction ofchiral (S)-(+)-1a with diphenyldiazomethane proceeds fully diastereoselectively to give the corresponding cyclopropane (+)-6a with the (Sc, SS) configuration determined by X-ray diffraction analysis. Diazopropane reacts with (S)-(+)-1a to give only one diastereoisomer of the pyrazoline cycloadduct (+)-2e which undergoes decomposition to the cyclopropane (+)-6b with preservation of configurational integrity." @default.
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- W2953171011 date "1999-12-01" @default.
- W2953171011 modified "2023-09-26" @default.
- W2953171011 title "1,3-Dipolar cycloaddition of diazoalkanes to racemic and optically active α-(diethoxyphosphoryl)vinyl p-tolyl sulfoxides: a new synthesis of 3-phosphorylpyrazoles and asymmetric synthesis of cyclopropanes" @default.
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- W2953171011 doi "https://doi.org/10.1016/s0040-4020(99)00943-6" @default.
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