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34
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85031169220
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13C NMR, IR, and mass spectrometric and/or elemental analyses. The stereochemistries were assigned based on NMR experiments (COSY, decoupling, and/or NOE).
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13C NMR, IR, and mass spectrometric and/or elemental analyses. The stereochemistries were assigned based on NMR experiments (COSY, decoupling, and/or NOE).
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85031166489
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Use of acetate buffer (pH 4.8, 0.1 M solution) suppressed the partial hydrolysis of O-TBS group during the reaction, and greatly improved the cyclization yields.
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Use of acetate buffer (pH 4.8, 0.1 M solution) suppressed the partial hydrolysis of O-TBS group during the reaction, and greatly improved the cyclization yields.
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6′ with various aldehydes is underway and the results will be reported in a full account.
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Further investigation of the interesting aldol process of the intermediate enolate 6′ with various aldehydes is underway and the results will be reported in a full account.
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3 afforded the syn diol stereoselectively. This reagent is known to give 1,3-anti diols preferentially in the reduction of β-hydroxyketone systems
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3 afforded the syn diol stereoselectively. This reagent is known to give 1,3-anti diols preferentially in the reduction of β-hydroxyketone systems.
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0037155542
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3P, diethyl azodicarboxylate, THF), a γ-lactone with retention of the 2′ stereochemistry (3-epimer of 20) was formed in 80% yield. A similar phenomenon and mechanistic study on Mitsunobu reaction of hydroxycarboxylic acids with hindered alcohols have been reported
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3P, diethyl azodicarboxylate, THF), a γ-lactone with retention of the 2′ stereochemistry (3-epimer of 20 ) was formed in 80% yield. A similar phenomenon and mechanistic study on Mitsunobu reaction of hydroxycarboxylic acids with hindered alcohols have been reported, see: Ahn, C.; Correia, R.; DeShong, P. J. Org. Chem. 2002, 67, 1751-1753 and Ahn, C.; Deshong, P. J. Org. Chem. 2002, 67, 1754-1759.
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0037155499
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3P, diethyl azodicarboxylate, THF), a γ-lactone with retention of the 2′ stereochemistry (3-epimer of 20 ) was formed in 80% yield. A similar phenomenon and mechanistic study on Mitsunobu reaction of hydroxycarboxylic acids with hindered alcohols have been reported, see: Ahn, C.; Correia, R.; DeShong, P. J. Org. Chem. 2002, 67, 1751-1753 and Ahn, C.; Deshong, P. J. Org. Chem. 2002, 67, 1754-1759.
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Deshong, P.2
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