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f) Sasai, H.; Kim, W.-S.; Suzuki, T.; Shibasaki, M.; Mitsuda, M.; Hasegawa, J.; Ohashi, T. Tetrahedron Lett. 1994, 35, 6123-6126.
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g) Sasai, H.; Yamada, Y. M. A.; Suzuki, T.; Shibasaki, M. Tetrahedron 1994, 50, 12313-12318.
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h) Sasai, H.; Tokunaga, T.; Watanabe, S.; Suzuki, T.; Itoh, N.; Shibasaki, M. J. Org. Chem. 1995, 60, 7388-7389.
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Shibasaki, M.6
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37
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0343905354
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in press
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2O (3.12 g, 8.40 mmol) in THF (100 mL) was sonicated for 30 min at room temperature. To this suspension was then added the above-prepared solution of dilithium binaphthoxide and 0.52 N NaO-t-Buin THF (4.85 mL, 2.52 mmol), dropwise at room temperature. After being stirred vigorously overnight at room temperature and then for 48 h at 50 °C, the reaction mixture was allowed to stand at room temperature. The resulting supernatant was used as an asymmetric catalyst (0.03 M). Sasai, H.; Watanabe, S.; Shibasaki, M. Enantiomer, in press.
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Enantiomer
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Sasai, H.1
Watanabe, S.2
Shibasaki, M.3
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38
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0343469560
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note
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The absolute configurations of the products except for 12 were determined by the Mosher method.
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39
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0342599558
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note
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3 derived LLB gave 2 in 45% ee (83% yield) even at -78 °C with a slow addition of 1. The optical purity of 2 was increased (74% ee, 88% yield) when pumping dried LLB, all the sol vent of LLB, was removed by pumping up and then redissolved in THF, was utilized as a catalyst.
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40
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0029981019
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Arai, T.; Bougauchi, M.; Sasai, H.; Shibasaki, M. J. Org. Chem. 1996, 61, 2926-2927.
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Arai, T.1
Bougauchi, M.2
Sasai, H.3
Shibasaki, M.4
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41
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33751154738
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a) Sasai, H.; Arai, S.; Tahara, Y.; Shibasaki, M. J. Org. Chem. 1995, 60, 6656-6657.
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Sasai, H.1
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Tahara, Y.3
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42
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0039150859
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b) Groger, H.; Saida, T.; Arai, S.; Martens, J.; Sasai, H.; Shibasaki, M. Tetrahedron Lett. 1996, 37, 9291-9292.
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Martens, J.4
Sasai, H.5
Shibasaki, M.6
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43
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33748240969
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a) Arai, T.; Sasai, H.; Aoe, K.; Okamura, K.; Date, T.; Shibasaki, M. Angew. Chem., Int. Ed. Engl. 1996, 35, 104-106.
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Arai, T.1
Sasai, H.2
Aoe, K.3
Okamura, K.4
Date, T.5
Shibasaki, M.6
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44
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0039338360
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b) Arai, T.; Yamada, Y. M. A.; Yamamoto, N.; Sasai, H.; Shibasaki, M. Chem. Eur. J., 1996, 2, 1368-1372.
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Arai, T.1
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Yamamoto, N.3
Sasai, H.4
Shibasaki, M.5
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45
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0343033825
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note
-
In the case of ALB catalyzed hydrophosphonylations, slow addition of aldehydes didn't improve ees.
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46
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11944252146
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See, also references 6h and 12a
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For the discussion of the multifunctional activities of heterobimetallic asymmetric catalysts, see: Sasai, H.; Arai, T.; Satow, Y.; Houk, K. N.; Shibasaki, M. J. Am. Chem. Soc. 1995, 117, 6194-6198. See, also references 6h and 12a.
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, vol.117
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Sasai, H.1
Arai, T.2
Satow, Y.3
Houk, K.N.4
Shibasaki, M.5
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