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The dehydration of d-mannose and the demethanolization of methyl-α-d-mannopyranoside (MαMP) or methyl-α-d-mannofuranoside (MαMF) were examined using microwave-assisted heating for a 3-min irradiation at temperature from 120 to 280°C in ordinary or dry sulfolane without any catalyst. The microwave-assisted heating of MαMP and MαMF smoothly proceeded to selectively afford the anhydromannoses, 1,6-anhydro-β-d-mannopyranose (AMP) and 1,6-anhydro-β-d-mannofuranose (AMF), respectively, in high yields. For MαMP in ordinary sulfolane at 240°C, AMP was selectively obtained in the AMF:AMP ratio of 4:96, whereas AMF was the major product at the AMF:AMP ratio of 97:3 from MαMF in dry sulfolane at 220°C.
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Toshifumi Satoh
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Organic letters,
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Carbohydrate research,
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