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21
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0009710515
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4. The solvent was then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-AcOEt = 60:1) to give the cycloadduct (6a), homoallylalcohol (10), and chlorohydrin (14) in 76%, 4%, and 4% yields, respectively
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4. The solvent was then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (eluent:hexane-AcOEt = 60:1) to give the cycloadduct (6a), homoallylalcohol (10), and chlorohydrin (14) in 76%, 4%, and 4% yields, respectively.
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22
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0009725566
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4 gave the cycloadduct (6a) in low yield (4%) and 1 was recovered in 46% yield
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4 gave the cycloadduct (6a) in low yield (4%) and 1 was recovered in 46% yield.
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23
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0009689038
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2 (1.2 ml) over 1 h period at -50 °C under an argon atmosphere. After workup was performed as detailed in procedure A, the cycloadduct (24a) was obtained in 79% yield
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2 (1.2 ml) over 1 h period at -50 °C under an argon atmosphere. After workup was performed as detailed in procedure A, the cycloadduct (24a) was obtained in 79% yield.
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