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note
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2 also effected the transformation; however, higher temperatures and reaction times were required.
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18244403108
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note
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See Supporting Information for details.
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18244393975
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note
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The yield of propargyl alcohol 6 was diminished by small amounts (< 10%) of Meerwein-Ponndorf-Verley reduction of 1a, presumably by intermediate A: Diagram presented However, neither side product was observed when the title reaction reaction was run using the conditions described in eq 1, further supporting our mechanistic interpretations.
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20
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0037020645
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Only two examples of enantioenriched glycolate aldolates of this type have been prepared, to our knowledge. One was by a chiral auxiliary method: Murata, Y.; Kamino, T.; Hosokawa, S.; Kobayashi, S. Tetrahedron Lett. 2002, 43, 8121. The other was prepared by a direct catalytic method involving chiral zinc complexes: Kumagai, N.; Matsunaga, S.; Kinoshita, T.; Harada, S.; Okada, S.; Sakamoto, S.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 2003, 125, 2169.
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Kobayashi, S.4
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21
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0037467125
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Only two examples of enantioenriched glycolate aldolates of this type have been prepared, to our knowledge. One was by a chiral auxiliary method: Murata, Y.; Kamino, T.; Hosokawa, S.; Kobayashi, S. Tetrahedron Lett. 2002, 43, 8121. The other was prepared by a direct catalytic method involving chiral zinc complexes: Kumagai, N.; Matsunaga, S.; Kinoshita, T.; Harada, S.; Okada, S.; Sakamoto, S.; Yamaguchi, K.; Shibasaki, M. J. Am. Chem. Soc. 2003, 125, 2169.
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23
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0032538014
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