Synthesis of optically pure fluorosubstituted isoxazolidines by 1,3-dipolar cycloaddition of nitrones to chiral methyl enol ethers of 3-fluoro-1-sulphinyl-2-propanones
作者:Pierfrancesco Bravo、Luca Broché、Alessandra Farina、Giovanni Fronza、Stefano Valdo Meille、Annamaria Merli
DOI:10.1016/s0957-4166(00)80057-9
日期:1993.10
Optically pure enol ether 4 undergoes 1,3-dipolar cycloaddition, with C,N-diphenylnitrone 5 to give the fluorosubstituted isoxazolidine 6 in a fully regio- and diastereoselective manner. The absolute configuration of 6 has been established by X-ray analysis. When changing the nitrone and/or the fluoro substitution pattern in compounds similar to 4, the same reactivity is observed.