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22744449953
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The absolute configuration of 4a was determined to be the S enantiomer by optical rotation studies of the cyclic urea derived from 4a; see ref. [5b] and the Supporting Information for details.
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29
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22744452251
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note
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Modification of the aromatic moiety gave only unsatisfactory results.
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22744432583
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See the Supporting Information
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See the Supporting Information.
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43
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22744440860
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see ref. [12b]
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The precise geometry of enolate 10 remains unclear despite extensive attempts, although we assume that the reaction proceeds through the Z enolate of 10; see ref. [12b].
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