-
1
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33749082762
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For some recent synthetic implications of carvone in organic synthesis, see: Srikrishna, A.; Reddy, T. J.; Kumar, P. P. J. Chem. Soc., Perkin Trans. 1 1998, 3143-3144 and references therein. For pulegone, see: Chen, C. Y.; Nagumo, S.; Akita, H. Chem. Pharm. Bull. 1996, 44, 2153-2156.
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2
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0029856447
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For some recent synthetic implications of carvone in organic synthesis, see: Srikrishna, A.; Reddy, T. J.; Kumar, P. P. J. Chem. Soc., Perkin Trans. 1 1998, 3143-3144 and references therein. For pulegone, see: Chen, C. Y.; Nagumo, S.; Akita, H. Chem. Pharm. Bull. 1996, 44, 2153-2156.
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3
-
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12044258371
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Chiral cyclohexenones can be obtained by derivatization of optically active natural products according to multistep sequences. (a) From sugars, see: Ferrier, R. J.; Middleton, S. Chem. Rev. 1993, 93, 2779-2831 and references therein.
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Ferrier, R.J.1
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84987505966
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(b) From pinene, see: Chapuis, C.; Brauchli, R.; Thommen, W. Helv. Chim. Acta 1993, 76, 535-544 and references therein.
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Chapuis, C.1
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5
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0030851937
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(c) From quinic acid, see: Barros, M. T.; Maycock, C. D.; Ventura, M. R. J. Org. Chem. 1997, 62, 3984-3988 and references therein.
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6
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37049073443
-
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(d) From quebrachitol, see: Barton, D. H. R.; Bath, S.; Billington, D. C.; Gero, S. D.; Quiclet-Sire, B.; Samadi, M. J. Chem. Soc., Perkin Trans. 1 1995, 1551-1558 and references therein.
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7
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0025900977
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Another approach is the kinetic resolution of a racemic mixture of starting materials where enzymes have been the mostly used see: (a) Polla, M.; Frejd, T. Tetrahedron 1991, 47, 5883-5894.
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(b) Miyaoka, H.; Sagawa, S.; Inoue, T.; Nagaoka, H.; Yamada, Y. Chem. Pharm. Bull. 1994, 42, 405-407.
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Miyaoka, H.1
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9
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0242528545
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(c) Weissfloch, A. N. E.; Kazlauskas, R. J. J. Org. Chem. 1995, 60, 6959-6969 and references therein. Resolution can be also achieved by using organometallics species:
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Weissfloch, A.N.E.1
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Enantioselective syntheses of 2-cyclohexenones have been reported: (a) Based on an asymmetric Diels-Alder reaction: Wada, E.; Yasuoka, H.; Kanemasa, S. Chem. Lett. 1994, 1637-1640; Kozmin, S. A.; Rawal, V. H. J. Am. Chem. Soc. 1997, 119, 7165-7166 and references therein.
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0030871612
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Enantioselective syntheses of 2-cyclohexenones have been reported: (a) Based on an asymmetric Diels-Alder reaction: Wada, E.; Yasuoka, H.; Kanemasa, S. Chem. Lett. 1994, 1637-1640; Kozmin, S. A.; Rawal, V. H. J. Am. Chem. Soc. 1997, 119, 7165-7166 and references therein.
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(b) Based on amino acid-catalysed aldolization: Fuji, K. Chem. Rev. 1993, 93, 2037-2066 and references therein.
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0025992651
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(d) The most efficient and general up-to-date method for synthesizing optically active 2-cyclohexenones has been developed by Meyers using optically active bicyclic lactams, see: Romo, D.; Meyers, A. I. Tetrahedron 1991, 47, 9503-9569. Schwarz, J. B.; Devine, P. N.; Meyers, A. I. Tetrahedron 1997, 53, 8795-8806 and references therein.
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0030854055
-
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and references therein
-
(d) The most efficient and general up-to-date method for synthesizing optically active 2-cyclohexenones has been developed by Meyers using optically active bicyclic lactams, see: Romo, D.; Meyers, A. I. Tetrahedron 1991, 47, 9503-9569. Schwarz, J. B.; Devine, P. N.; Meyers, A. I. Tetrahedron 1997, 53, 8795-8806 and references therein.
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(a) Asaoka, M.; Shima, K.; Takei, H. Tetrahedron Lett. 1987, 28, 5669-5672. Asaoka, M.; Takei, H. J. Synth. Org. Chem. Jpn. 1990, 48, 216-228 (review in Japanese).
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Portions of this work have been communicated: Hikichi, S.; Hareau, G. P-J.; Sato, F. Tetrahedron Lett. 1997, 38, 8299-8302. Hareau, G. P-J.; Hikichi, S.; Sato, F. Angew. Chem., Int. Ed. Engl. 1998, 37, 2099-2101.
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Portions of this work have been communicated: Hikichi, S.; Hareau, G. P-J.; Sato, F. Tetrahedron Lett. 1997, 38, 8299-8302. Hareau, G. P-J.; Hikichi, S.; Sato, F. Angew. Chem., Int. Ed. Engl. 1998, 37, 2099-2101.
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Helmchen, G., Hoffman, R. W., Mulzer, J., Shauman, E., Eds.
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The conjugate addition of organocuprates onto 5-substituted-2-cyclohexenones yields generally a very high proportion of the trans-adduct; see the following reviews and references therein: Yamamoto, Y. Methoden Org. Chem. (Houben-Weyl), Engl. Ed. 1995, E21b, 2041-2067 (Helmchen, G., Hoffman, R. W., Mulzer, J., Shauman, E., Eds.). Lipshutz, B. H. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Eds.; Pergamon Press: Tokyo, 1991; Vol. 1, pp 107-138. Kozlowski, J. A. Ibid. Vol. 4, pp 169-198. Lipshutz, B. H.; Sengupta, S. Org. React. 1992, 41, 135- 631.
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0001189279
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Trost, B. M., Fleming, I., Eds.; Pergamon Press: Tokyo
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The conjugate addition of organocuprates onto 5-substituted-2- cyclohexenones yields generally a very high proportion of the trans-adduct; see the following reviews and references therein: Yamamoto, Y. Methoden Org. Chem. (Houben-Weyl), Engl. Ed. 1995, E21b, 2041-2067 (Helmchen, G., Hoffman, R. W., Mulzer, J., Shauman, E., Eds.). Lipshutz, B. H. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Eds.; Pergamon Press: Tokyo, 1991; Vol. 1, pp 107-138. Kozlowski, J. A. Ibid. Vol. 4, pp 169-198. Lipshutz, B. H.; Sengupta, S. Org. React. 1992, 41, 135- 631.
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The conjugate addition of organocuprates onto 5-substituted-2- cyclohexenones yields generally a very high proportion of the trans-adduct; see the following reviews and references therein: Yamamoto, Y. Methoden Org. Chem. (Houben-Weyl), Engl. Ed. 1995, E21b, 2041-2067 (Helmchen, G., Hoffman, R. W., Mulzer, J., Shauman, E., Eds.). Lipshutz, B. H. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Eds.; Pergamon Press: Tokyo, 1991; Vol. 1, pp 107-138. Kozlowski, J. A. Ibid. Vol. 4, pp 169-198. Lipshutz, B. H.; Sengupta, S. Org. React. 1992, 41, 135- 631.
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39
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0000220284
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The conjugate addition of organocuprates onto 5-substituted-2- cyclohexenones yields generally a very high proportion of the trans-adduct; see the following reviews and references therein: Yamamoto, Y. Methoden Org. Chem. (Houben-Weyl), Engl. Ed. 1995, E21b, 2041-2067 (Helmchen, G., Hoffman, R. W., Mulzer, J., Shauman, E., Eds.). Lipshutz, B. H. In Comprehensive Organic Synthesis; Trost, B. M., Fleming, I., Eds.; Pergamon Press: Tokyo, 1991; Vol. 1, pp 107-138. Kozlowski, J. A. Ibid. Vol. 4, pp 169-198. Lipshutz, B. H.; Sengupta, S. Org. React. 1992, 41, 135-631.
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40
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0032560967
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and references therein
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2 (higher-order) indicate that the reagents have been prepared stoichiometrically by mixing CuCN and RLi in the 1:1 and 1:2 ratios, respectively, see: Kronenburg, C. M. P.; Jastrzebski, J. T. B. H.; Spek, A. L.; van Koten, G. J. Am. Chem. Soc. 1998, 120, 9688-9689 and references therein. See also: Organocopper Reagents: A Practical Approach; Taylor, R. J. K., Ed.; Oxford University Press: Oxford, U.K., 1994. The terms "1:1 cyanocuprates" and "1:2 cyanocuprates" are now preferred to "lower-" and "higher-order cyanocuprates" nevertheless, for convenience, we have conserved the old terminology.
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0032560967
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Oxford University Press: Oxford, U.K.
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2 (higher-order) indicate that the reagents have been prepared stoichiometrically by mixing CuCN and RLi in the 1:1 and 1:2 ratios, respectively, see: Kronenburg, C. M. P.; Jastrzebski, J. T. B. H.; Spek, A. L.; van Koten, G. J. Am. Chem. Soc. 1998, 120, 9688-9689 and references therein. See also: Organocopper Reagents: A Practical Approach; Taylor, R. J. K., Ed.; Oxford University Press: Oxford, U.K., 1994. The terms "1:1 cyanocuprates" and "1:2 cyanocuprates" are now preferred to "lower-" and "higher-order cyanocuprates" nevertheless, for convenience, we have conserved the old terminology.
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(1994)
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Taylor, R.J.K.1
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42
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6244279150
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A selectivity of 92:8 in favor of the cis isomer has been reported on a 4-oxy-substituted spirocyclohexenone: Corey, E. J.; Boaz, N. W. Tetrahedron Lett. 1985, 26, 6015-6018. cis-Michael-type addition has been observed on 4-oxy-substituted-2-cyclohexenone: Jeroncic, L. O.; Cabal, M. P.; Danishefsky, S. J. J. Org. Chem. 1991, 56, 387-395.
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0001280326
-
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A selectivity of 92:8 in favor of the cis isomer has been reported on a 4-oxy-substituted spirocyclohexenone: Corey, E. J.; Boaz, N. W. Tetrahedron Lett. 1985, 26, 6015-6018. cis-Michael-type addition has been observed on 4-oxy-substituted-2-cyclohexenone: Jeroncic, L. O.; Cabal, M. P.; Danishefsky, S. J. J. Org. Chem. 1991, 56, 387-395.
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44
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-
0345680346
-
-
note
-
ee calculated from chiral GC or HPLC: chiral GC (Chirasil-DEX/ Chrompack, 0.25 mm × 25 m, DF = 0.25); chiral HPLC (Daicel Chiralcel OB-H).
-
-
-
-
45
-
-
0345248713
-
-
note
-
The reductive elimination of the cis-adduct of 13 does not proceed easily at r.t. so that the treatment at r.t. with DBU of a cis/trans mixture of 13 can result in a kinetic resolution of the starting material, thus affording the eliminated product 14 with high ee.
-
-
-
-
46
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0012690092
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3): Asaoka, M.; Shima, K.; Fujii, N.; Takei, H. Tetrahedron 1988, 44, 4757-4766.
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2O required 1 h at -78 °C and in some cases, such as R = Me, s-Bu, t-Bu and Ph, a gradual elevation of the temperature to 0 °C (see Table 2) to go to completion.
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