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24
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12344317282
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Very recently, multistep syntheses of similar compounds have been described; see: a) A. K. Ghosh, C.-X. Xu, S. S. Kulkarni, D. Wink, Org. Lett. 2005, 7, 7;
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9944264538
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b) T. Sommermann, B. G. Kim, K. Peters, E.-M. Peters, T. Linker, Chem. Commun. 2004, 22, 2624;
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26
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2942628414
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Sridhar, P.R.1
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27
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0032537015
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Only two compounds of this type have been described in the literature as by-products in low-yielding Povarov-type reactions; see: a) R. Baudelle, P. Melnyk, B. Déprez, A. Tartar, Tetrahedron 1998, 54, 4125;
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Baudelle, R.1
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28
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27144501601
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Ref. [5a]
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and b) Ref. [5a].
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29
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0042346444
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W. J. N. Meester, J. H. van Maarseveen, H. E. Schoemaker, H. Hiemstra, F. P. J. T. Rutjes, Eur. J. Org. Chem. 2003, 2519.
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30
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0000792433
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Ed.: H. Yamamoto, Wiley-VCH, Weinheim
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S. Kobayashi in Lewis Acids in Organic Synthesis, Vol. 2 (Ed.: H. Yamamoto), Wiley-VCH, Weinheim, 2000, p. 883.
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Kobayashi, S.1
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31
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0034727304
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For related processes, see: a) A. K. Ghosh, R. Kawahama, D. Wink, Tetrahedron Lett. 2000, 41, 8425;
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Ghosh, A.K.1
Kawahama, R.2
Wink, D.3
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33
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27144532238
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The minor isomer in these series is the epimer at the N-substituted stereogenic center
-
The minor isomer in these series is the epimer at the N-substituted stereogenic center.
-
-
-
-
36
-
-
27144525339
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-
note
-
Aldehydes with α-hydrogen atoms were not included in this study.
-
-
-
-
37
-
-
27144551790
-
-
note
-
In these series, protected (isopropylidene) D-ribonolactone and D-galactose derivatives were efficiently used as terminators, and the corresponding adducts were obtained with good conversions as mixtures of diastereomers.
-
-
-
-
38
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0742272064
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For brevicomin-related derivatives, see: V. I. Tyvorskii, D. A. Astashko, O. G. Kulinkovich, Tetrahedron 2004, 60, 1473.
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(2004)
Tetrahedron
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-
Tyvorskii, V.I.1
Astashko, D.A.2
Kulinkovich, O.G.3
-
39
-
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27144557120
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-
note
-
Experiments run at higher temperatures resulted in very complex mixtures.
-
-
-
-
40
-
-
27144529385
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-
For recent results, see: a) J. S. Yadav, B. V. S. Reddy, K. V. Rao, K. S. Raj, A. R. Prasad, S. K. Kumar, A. C. Kunwar, P. Jayaprakash, B. Jagannath, Angew. Chem. 2003, 115, 5356;
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Yadav, J.S.1
Reddy, B.V.S.2
Rao, K.V.3
Raj, K.S.4
Prasad, A.R.5
Kumar, S.K.6
Kunwar, A.C.7
Jayaprakash, P.8
Jagannath, B.9
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42
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0042412071
-
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b) S. K. Das, K. A. Reddy, J. Roy, Synlett 2003, 11, 1607;
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Synlett
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Das, S.K.1
Reddy, K.A.2
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43
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0035813377
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c) R. A. Batey, D. A. Powell, A. Acton, A. J. Lough, Tetrahedron Lett. 2001, 42, 7935;
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Batey, R.A.1
Powell, D.A.2
Acton, A.3
Lough, A.J.4
-
45
-
-
27144460995
-
-
note
-
To our knowledge, this is the first example of Povarov-type reaction with glycals.
-
-
-
-
48
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78650001613
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E. Borrione, M. Prato, G. Scorrano, M. Stivanello, V. Lucchini, J. Heterocycl. Chem. 1988, 25, 1831.
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-
Borrione, E.1
Prato, M.2
Scorrano, G.3
Stivanello, M.4
Lucchini, V.5
-
49
-
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27144475423
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-
note
-
Studies directed toward the improvement of the stereoselectivity of the process are underway; we are currently evaluating the role of additives and ligands in these reactions.
-
-
-
-
50
-
-
27144438395
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-
note
-
Note added in proof: Dihydrofurans react in this MCR following similar trends to dihydropyrans; for examples, see the Supporting Information.
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