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1
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0000084915
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For recent reviews on catalytic asymmetric synthesis of quaternary carbon centers: a) E. J. Corey, A. Guzman-Perez, Angew. Chem. 1998, 110, 402;
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Angew. Chem.
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T. Ooi, T. Miki, M. Taniguchi, M. Shiraishi, M. Takeuchi, K. Maruoka, Angew. Chem. 2003, 115, 4111;
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Ooi, T.1
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Taniguchi, M.3
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Maruoka, K.6
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13444267639
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see also: T. Ooi, T. Miki, K. Maruoka, Org. Lett. 2005, 7, 191.
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18844451481
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For recent examples of catalytic asymmetric synthesis of α-quaternary keto lactones, see: a) H. Li, Y. Wang, L. Tang, F. Wu, X. Liu, C. Guo, B. M. Foxman, L. Deng, Angew. Chem. 2005, 117, 107;
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Foxman, B.M.7
Deng, L.8
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0042349914
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a) T. Ooi, M. Taniguchi, M. Kameda, K. Maruoka, Angew. Chem. 2002, 114, 4724;
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b) T. Ooi, M. Kameda, M. Taniguchi, K. Maruoka, J. Am. Chem. Soc. 2004, 126, 9685;
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4644273111
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c) T. Ooi, S. Fujioka, K. Maruoka, J. Am. Chem. Soc. 2004, 126, 11790;
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17144405994
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d) T. Ooi, M. Takeuchi, D. Kato, Y. Uematsu, E. Tayama, D. Sakai, K. Maruoka, J. Am. Chem. Soc. 2005, 127, 5073.
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Ooi, T.1
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Maruoka, K.7
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19
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33748276695
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note
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[13] eventually confirming the absolute configuration of the adjacent α-quaternary stereocenter of 6 to be S. (Diagram Presented)
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20
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33748254862
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note
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Unfortunately, the reaction with less reactive alkyl halides such as methyl iodide proceeded very sluggishly under similar conditions.
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21
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0000482680
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a) G. I. Georg, X. Guan, J. Kant, Tetrahedron Lett. 1988, 29, 403;
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b) M. Moreno-Mañas, E. Trepat, R. M. Sebastian, A. Vallribera, Tetrahedron: Asymmetry 1999, 10, 4211;
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0035917343
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c) M. Tanaka, M. Oba, K. Tamai, H. Suemune, J. Org. Chem. 2001, 66, 2667;
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0037424735
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d) H.-J. Cristau, X. Marat, J.-P. Vors, J.-L. Pirat, Tetrahedron Lett. 2003, 44, 3179;
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e) M. Tanaka, S. Nishimura, M. Oba, Y. Demizu, M. Kurihara, H. Suemune, Chem. Eur. J. 2003, 9, 3082.
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27
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0024382675
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For similar acylation of γ-butyrolactone, see, for example: a) M. M. Campbell, J. L. Fox, M. Sainsbury, Y. Liu Tetrahedron 1989, 45, 4551;
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C. R. Sarko, I. C. Guch, M. DiMare, J. Org. Chem. 1994, 59, 705.
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31
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0008595242
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For a similar stereochemical assignment of β-hydroxy lactones, see: a) M. Takeshita, H. Yanagihara, S. Yoshida, Heterocycles 1992, 33, 489;
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Heterocycles
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33749084026
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b) M. Abe, M. Ikeda, M. Nojima, J. Chem. Soc., Perkin Trans. 1 1998, 3261;
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0036192261
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c) L. H. P. Teixeira, M. C. B. V. de Souza, M. C. K. V. Ramos, F. R. de Aquino Neto, E. J. Barreiro, C. A. M. Fraga, Synth. Commun. 2002, 32, 505.
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Teixeira, L.H.P.1
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I. Ohtani, T. Kusumi, Y. Kashman, H. Kakisawa, J. Am. Chem. Soc. 1991, 113, 4092.
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