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13844268358
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note
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Use of 1 equiv of silver perchlorate on Celite led to a fast conversion to give 4 in 85% yield.
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38
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note
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2 (8:2, EtOAc:hexanes) to yield 39 mg (76%) of 4 as a colorless oil.
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44
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13844265007
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note
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In all reactions, a minor side product was derived from decomposition of the glycal epoxide under the Lewis acidic conditions. At lower temperatures (0°C), the conversion was similar, but the side product was also formed to a comparable extent.
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45
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13844251140
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note
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Both 4-octyne and 6-dodecyne were used under the typical reaction conditions, but no significant product formation was observed. The reaction with these substrates was not further optimized.
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46
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note
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Deactivating carbohydrate protecting groups such as acetates have proven unsatisfactory in previous work with glycal epoxides and were not explored in the present studies; see refs 10 and 71.
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