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41
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0037438599
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There are reports of direct asymmetric Mannich reactions with unmodified ketones, see: (a) Notz, W.; Sakthivel, K.; Bui, T.; Zhong, G.; Barbas, C. F. III Tetrahedron Lett. 2001, 42, 199. (b) Juhl, K.; Gathergood, N.; Jørgensen, K. A. Angew Chem. Int. Ed. 2001, 40, 2995. (c) Yamasaki, S.; Iida, T.; Shibasaki, M. Tetrahedron 1999, 55, 8857. (d) List, B. J. Am. Chem. Soc. 2000, 122, 9336. (e) Córdova, A.; Notz, W.; Zhong, G.; Betancort, J. M.; Barbas, C. F. III J. Am. Chem. Soc. 2002, 124, 1842. (f) Trost, B. M.; Terrell, L. R. J. Am. Chem. Soc. 2003, 125, 338. (g) Matsunaga, S.; Kumagai, N. ; Harada, S.; Shibasaki, M. J. Am. Chem. Soc. 2003, 125, 4712.
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(2003)
J. Am. Chem. Soc.
, vol.125
, pp. 338
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Trost, B.M.1
Terrell, L.R.2
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42
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0037462104
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There are reports of direct asymmetric Mannich reactions with unmodified ketones, see: (a) Notz, W.; Sakthivel, K.; Bui, T.; Zhong, G.; Barbas, C. F. III Tetrahedron Lett. 2001, 42, 199. (b) Juhl, K.; Gathergood, N.; Jørgensen, K. A. Angew Chem. Int. Ed. 2001, 40, 2995. (c) Yamasaki, S.; Iida, T.; Shibasaki, M. Tetrahedron 1999, 55, 8857. (d) List, B. J. Am. Chem. Soc. 2000, 122, 9336. (e) Córdova, A.; Notz, W.; Zhong, G.; Betancort, J. M.; Barbas, C. F. III J. Am. Chem. Soc. 2002, 124, 1842. (f) Trost, B. M.; Terrell, L. R. J. Am. Chem. Soc. 2003, 125, 338. (g) Matsunaga, S.; Kumagai, N. ; Harada, S.; Shibasaki, M. J. Am. Chem. Soc. 2003, 125, 4712.
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(2003)
J. Am. Chem. Soc.
, vol.125
, pp. 4712
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Matsunaga, S.1
Kumagai, N.2
Harada, S.3
Shibasaki, M.4
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43
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0042161057
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note
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We observed that Mannich product 1 was unstable and racemized if stored at room temperature or subjected to silica gel column chromatography. In addition, 1 is prone to epimerization that decreases the diastereomeric ratio.
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44
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0042662071
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note
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2O: 40% yield, dr>10:1, 99% ee; and at 4 °C: THF: 36% yield, dr>10:1, >99% ee; dioxane: 62% yield, dr>10:1, 99% ee.
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45
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0041660120
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note
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4 (316.1423).
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46
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0042662072
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note
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4 (372.2048968).
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47
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0042662070
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note
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4), concentrated, and purified by flash column chromatography (silica gel, mixtures of hexanes/EtOAc) to afford 2.
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48
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0002460501
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(a) NMR-data of the major diastereomer of PMP-deprotected 6 was identical to the previously reported syndiastereomer, see: Jaeger, V.; Buss, V. ; Schwab, W. Liebigs Arm. Chem. 1980, 122.
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(1980)
Liebigs Arm. Chem.
, pp. 122
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Jaeger, V.1
Buss, V.2
Schwab, W.3
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49
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0043162946
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note
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13C NMR: δ = 12.0, 40.9, 59.1, 66.2, 126.9, 127.1, 128.2, 143.9.
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50
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0035966165
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(c) L-Proline derived 6 had the same retention time as (2S,3S)-6 that had been synthesized via known procedures, see: Vicario, J. L.; Badía, D.; Carrillo, L. J. Org. Chem. 2001, 66, 9030.
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(2001)
J. Org. Chem.
, vol.66
, pp. 9030
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Vicario, J.L.1
Badía, D.2
Carrillo, L.3
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52
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0042161056
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note
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2 (271.172206).
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