四氢吡喃（THP）是由一个含有五个碳原子和一个氧原子的饱和六元环组成的有机化合物。它被命名为吡喃，它包含两个双键，并且可以通过添加四个氢而产生。在2013，其优选的IUPAC名称被确立为OxAn。化合物为无色挥发性液体，但不清楚。然而，四氢吡喃衍生物更为常见。由醇和3,4-二氢吡喃反应得到的2-四氢吡喃(THP-)醚在有机合成中通常用作保护基。此外，四氢吡喃环体系，即五个碳原子和一个氧，是吡喃糖如葡萄糖的核心。在气相中，THP存在于其最低能量Cs对称椅构象中。
((2R,3S,4S,5R,6S)-6-((5,7-Dihydroxy-2-(4-hydroxyphenyl)-4-oxo-4H-chromen-3-yl)oxy)-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl)methyl (E)-3-(4-hydroxyphenyl)acrylate
N-(4-(4-Fluorophenyl)-5-((E)-2-((2S,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl)vinyl)-6-isopropylpyrimidin-2-yl)-N-methylmethanesulfonamide
2-(4-(Trifluoromethyl)phenyl)-3,5,7,8-tetrahydro-4H-thiopyrano[4,3-d]pyrimidin-4-one
2-(Tetrahydro-2H-pyran-4-yl)ethanamine hydrochloride
6-Heptyltetrahydro-2H-pyran-2-one
6-Octyltetrahydro-2H-pyran-2-one
6-Hexyltetrahydro-2H-pyran-2-one
Tetrahydro-2H-pyran-2-one
2,2,6,6-Tetramethyl-2H-3,5,6-trihydropyran-4-one
4-Phenyltetrahydro-2H-pyran-4-carbonitrile
2-Oxa-9-azaspiro[5.5]undecane hydrochloride
(2S,3R,4S,5S,6R)-6-(Hydroxymethyl)tetrahydro-2H-pyran-2,3,4,5-tetraol hydrate
1,3,6-Trihydroxy-2-((2S,3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)-7-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)-9H-xanthen-9-one
Ethyl 4-oxotetrahydro-2H-pyran-2-carboxylate
4-Methyl-7-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)-2H-chromen-2-one
4-Methyl-7-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)-2H-chromen-2-one
(3R,4R,5R,6R)-3-Acetamido-6-(acetoxymethyl)tetrahydro-2H-pyran-2,4,5-triyl triacetate
4-Methyl-7-(((2S,3R,4S,5R)-3,4,5-trihydroxytetrahydro-2H-pyran-2-yl)oxy)-2H-chromen-2-one
4-Methylumbelliferyl 2-acetamido-2-deoxy-β-D-glucopyranoside
tert-Butyl 2-(tetrahydro-2H-pyran-4-yl)hydrazinecarboxylate
(2R,3R,4S,5R,6S)-5-(Benzyloxy)-2-((benzyloxy)methyl)-6-(4-methoxyphenoxy)tetrahydro-2H-pyran-3,4-diol
(2R,2'R,3S,3'S,4S,4'S,5R,5'R,6R,6'R)-6,6'-Oxybis(2-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol)
(3S,4S,5R,6R)-6-((Benzoyloxy)methyl)tetrahydro-2H-pyran-2,3,4,5-tetrayl tetrabenzoate
(2S,4aR,6aS,6bR,8aR,9R,10R,11S,12aR,12bR,14bS)-10-(((2S,3R,4R,5R)-3,4-Dihydroxy-5-(((2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)oxy)-11-hydroxy-9-(hydroxymethyl)-2-(methoxycarbonyl)-2,6a,6b,9,12
2-((Tetrahydro-2H-pyran-2-yl)oxy)ethanol
2-(Tetrahydro-2H-pyran-4-yl)ethanol
(2S,3R,4S,5S,6R)-2-(((6aR,12aR)-6a,12a-Dihydro-6H-[1,3]dioxolo[4',5':5,6]benzofuro[3,2-c]chromen-3-yl)oxy)-6-(hydroxymethyl)tetrahydro-2H-pyran-3,4,5-triol
7-Oxa-2-azaspiro[3.5]nonane
(3aR,5R,6S,7R,7aR)-2-(Ethylamino)-5-(hydroxymethyl)-5,6,7,7a-tetrahydro-3aH-pyrano[3,2-d]thiazole-6,7-diol
2-Oxa-9-azaspiro[5.5]undecane
