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Springer-Verlag: Berlin
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For recent reviews, see: Schoffers, E.; Golebiowski, A.; Johnson, C. R. Tetrahedron 1996, 52, 3769-3826. Bornscheuer, U. T.; Kazlauskas, R. J. In Hydrolases in Organic Synthesis; Wiley: Weinheim, 1999. Theil, F. Tetrahedron 2000, 56, 2905-2919. Faber, K. In Biotransformations in Organic Chemistry, 4th ed.; Springer-Verlag: Berlin, 2000. Roberts, S. M. J. Chem. Soc., Perkin Trans. 1 2001, 1475-1499.
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For recent reviews, see: Schoffers, E.; Golebiowski, A.; Johnson, C. R. Tetrahedron 1996, 52, 3769-3826. Bornscheuer, U. T.; Kazlauskas, R. J. In Hydrolases in Organic Synthesis; Wiley: Weinheim, 1999. Theil, F. Tetrahedron 2000, 56, 2905-2919. Faber, K. In Biotransformations in Organic Chemistry, 4th ed.; Springer-Verlag: Berlin, 2000. Roberts, S. M. J. Chem. Soc., Perkin Trans. 1 2001, 1475-1499.
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1842446800
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note
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Nonenzymatic desymmetrization of the oxindoles or indolines having two identical substituents at the C3 position has never been reported to the best of our knowledge.
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25
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37049068805
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For migrations on the esterification approaches, see: (i) Nicolosi, G.; Patti, A.; Piattelli, M.; Sanfilippo, C. Tetrahedron: Asymmetry 1994, 5, 283-288.
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For synthetic applications, see: (c) Akai, S.; Tsujino, T.; Fukuda, N.; Iio, K.; Takeda, Y.; Kawaguchi, K.; Naka, T.; Higuchi, K.; Kita, Y. Org. Lett. 2001, 3, 4015-4018.
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Part of this study was reported in a preliminary communication, see: Akai, S.; Tsujino, T.; Naka, T.; Tanimoto, K.; Kita, Y. Tetrahedron Lett. 2001, 42, 7315-7317.
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43
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0032541597
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because of the tardy reaction
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Preparation of 7b was carried out at a temperature (65 °C) higher than that in the reported method (Rajeswaran, W. G.; Cohen, L. A. Tetrahedron 1998, 54, 11375-11380) because of the tardy reaction.
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Crestini, C.; Saladino, R. Synth. Commun. 1994, 24, 2835-2841. For the preparation of N-benzylisatin, see: Singh, R. P.; Majumder, U.; Shreeve, J. M. J. Org. Chem. 2001, 66, 6263-6267.
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46
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0021796623
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For previous examples of bis-hydroxymethylation at the α-position of the ketones, see: Schneider, G.; Wölfling, J.; Hackler, L.; Meskó, E.; Dombi, G. Synthesis 1985, 194-197.
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Schneider, G.1
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47
-
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1842499038
-
-
note
-
2O and THF at 30 °C: C. rugosa lipases (Amano AY and Roche Diagnostics CHIRAZYME L-3), C. antarctica lipase (Roche Diagnostics CHIRAZYME L-2), Mucor miehei lipase (Roche Diagnostics CHIRAZYME L-9), Pseudomonas aeruginosa lipase (Toyobo LIP), Pseudomonas sp. lipase (Amano AK), Pseudomonas cepacia lipases (Amano AH and PS), porcine pancreas (Amano), and pig liver esterase (Amano).
-
-
-
-
48
-
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1842446799
-
-
note
-
Caution: During the workup of the transesterification reaction of 3, viz., the filtration of the reaction mixture through a Celite pad followed by concentration of the filtrate in vacuo, we occasionally observed the formation of 3-acetoxymethyl-3-(furoyloxymethy)oxindoles in variable yields. This often occurred when we used a large excess of 5 (for instance, 5 equiv), which resulted in decreasing yields of 2. The side-product seemed to be generated by the acetylation of the optically active 2. The remaining 5 was likely to be involved to some degree, although we have not specified the exact factor that induces the undesired reaction. The side-reaction could be suppressed by stirring the above-mentioned filtrate with water for 30 min to decompose 5 and to extract the resultant 2-furoic acid with the aqueous phase (for details, see Experimental Section).
-
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49
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0032888527
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Matsugi, M.1
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1842603616
-
-
note
-
3 in MeOH at room temperature caused a significant racemization of 9 (12% ee) probably via the retro-aldol-aldol reaction.10c The use of Dibal-H successfully cleaved the ester bonding of 8 to give 9 (99% ee, 50% yield, 77% yield based on the consumed 8) and the recovered 8 (35% yield).
-
-
-
-
52
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0032496952
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(a) Ashimori, A.; Bachand, B.; Overman, L. E.; Poon, D. J. J. Am. Chem. Soc. 1998, 120, 6477-6487.
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Ashimori, A.1
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53
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0032496939
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(b) Ashimori, A.; Bachand, B.; Calter, M. A.; Govek, S. P.; Overman, L. E.; Poon, D. J. J. Am. Chem. Soc. 1998, 120, 6488-6499.
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Ashimori, A.1
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Overman, L.E.5
Poon, D.J.6
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54
-
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1842551379
-
-
note
-
2 column chromatography.10b
-
-
-
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55
-
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1842499034
-
-
note
-
3N for the chromatography was effective to prevent the contamination.
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