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In the presence of Eu(fod)3, (1E)-(2′,3′,4′,6′-tetra-O-acetyl-I²-D-glucopyranosyloxy)buta-1,3-diene and its (3Z)-4-O-acetyl derivative undergo Re-face and endo selective hereto Diels-Alder reactions with 4-nitrobenzaldehyde, 5-nitrofuran-2-carbaldehyde and 5-nitrothiophene-2-carbaldehyde. The cycloadducts are converted into the title compounds, early examples of ‘free’ 5-C-arylpentopyranoses.
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Reference：
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics