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A new and efficient ligandless cross-coupling reaction of 6-iodouridine with various boronic acids in the presence of Na 2 PdCl 4 was performed at room temperature in aerobic water. The target 6-aryl analogues were obtained in moderate to good yields depending on the boronic acid nature.
Cycloaddition reactions of activated exo-glycals and nitrones proceeded only under microwave activation, with excellent facial selectivities on furanoglycosylidenes and good stereocontrol on the nitrone producing only two diastereomeric spiroisoxazolidines. α/β-Spiro sugar-isoxazolidines are obtained from pyrano exo-glycals. The cycloaddition reaction with nitrile oxide proceeds at room temperature...
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