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For examples of nonasymmetric, but diastereoselective, reduction of racemic a-substituted β-ketoamides, see: (a)
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For examples of nonasymmetric, but diastereoselective, reduction of racemic a-substituted β-ketoamides, see: (a) Bartoli, G.; Bosco, M.; Marcantoni, E.; Melchiorre, P.; Rinaldi, S.; Sambri, L. Synlett 2004, 1, 73.
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41
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75749158227
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See Supporting Information for the synthesis of this compound.
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See Supporting Information for the synthesis of this compound.
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42
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33845471613
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75749100702
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note
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For ease of discussion, the term "enantioselectivity" refers to the absolute configuration at carbon 2 and 3 of the syn-epimer 3a while ignoring the fixed stereocenter at the benzylic carbon labeled 6 [i.e., (2R,3R,6S) vs (2S,3S,6S)].
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44
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75749156697
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note
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The absolute stereochemistry was confirmed by X-ray single-crystal structure (see Supporting Information). Additional information can be found at the Cambridge Crystallographic Data Centre (CCDC) with deposition code of CCDC 752316.
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45
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0022516675
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For phase transfer catalyzed cyclization of O-phosphorylated or O-benzoylated substrates, see ref.8c For a nonphase transfer promoted process
-
For phase transfer catalyzed cyclization of O-phosphorylated or O-benzoylated substrates, see ref.8c For a nonphase transfer promoted process, see: Evans, D. A.; Sjogren, E. B. Tetrahedron Lett. 1986,27, 3119.
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75749116036
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note
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While executing the mesylation at higher temperatures (>5 °C) resulted in partial chloride displacement leading to syn β-lactams, performing the cyclization under homogenous conditions (KOtBu/THF or LiHMDS/ THF) gave initially the trans-β-lactam 6, which during the course of the reaction equilibrated rapidly to a 4:1 mixture of trans:syn β-lactams.
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-
-
49
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75749111079
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note
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3Si: C, 50.57; H, 5.09; N, 1.97. Found: C, 50.72; H, 5.10; N, 1.86.
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