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The reaction of 3a with 6a with the G-II catalyst is known in the literature to give 5a.[6f] However, the product could not be separated from the catalyst. After repetition of this reaction several times, we only obtained dimerization of 6a.
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[6f] However, the product could not be separated from the catalyst. After repetition of this reaction several times, we only obtained dimerization of 6a.
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The diastereomeric ratio was determined by 1 HNMR spectroscopy. Assignment of the stereocenters was based on conversion of 9a into the final compound 1.
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1HNMR spectroscopy. Assignment of the stereocenters was based on conversion of 9a into the final compound 1.
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84899758017
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For matched or mismatched stereoselectivity in double diastereoselection in asymmetric dihydroxylation of chiral olefin substrates, see ref.14a.
-
For matched or mismatched stereoselectivity in double diastereoselection in asymmetric dihydroxylation of chiral olefin substrates, see ref.14a.
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51
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84899747879
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For a similar highly diastereoselective reduction, see ref.6d.
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For a similar highly diastereoselective reduction, see ref.6d.
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52
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84899722316
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The SAD reaction of 5b is known in the literature to give nonisolable products. 6f] Reaction details were not available.
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[6f] Reaction details were not available.
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A provisional process patent on this work has been filed, application no. 1780/MUM/2012.
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A provisional process patent on this work has been filed, application no. 1780/MUM/2012.
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