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33645684135
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dr 73:27
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The following literature procedures were tested which led in our hands to the diastereomeric ratios (dr) indicated: a) M. Yamashita, Y. Kato, R. Suemitsu, Chem. Lett. 1980, 847-848 (dr 73:27);
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100
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dr 80:20
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b) J. H. Tatlock, V. J. Kahlish, H. E. Parge, D. R. Knighton, R. E. Showalter, C. T. Lewis, J. V. French, J. E. Villafranca, Bioorg. Med. Chem. Lett. 1995, 5, 2489-2494 (dr 80:20);
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103
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33645686985
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note
-
Other methods for the introduction of the side chain have been briefly explored but remained largely unsuccessful. This includes attempted alkylation of the vinyllithium species derived from the sulfonyl hydrazone of carvomenthone 17, with or without prior transmetalation to a vinylcopper species.
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b) recent review: H.-J. Liu, K.-S. Shia, X. Shang, B.-Y. Zhu, Tetrahedron 1999, 55, 3803-3830.
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Liu, H.-J.1
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0030443083
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For previous applications of organocerium reagents from our laboratory see: a) A. Fürstner, K. Langemann, J. Org. Chem. 1996, 61, 8746-8749;
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a) K.-J. Haack, S. Hashiguchi, A. Fujii, T. Ikariya, R. Noyori, Angew. Chem. 1997, 109, 297-300;
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Haack, K.-J.1
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Ikariya, T.4
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113
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33645684379
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note
-
Although the diastereoselectivity of the transfer hydrogenation was only -85:15 in both cases, pure samples of the individual isomers can be obtained by careful flash chromatography at this stage. The absolute stereochemistry of the newly formed chiral center was confirmed by the analysis of the corresponding Mosher esters and is in line with the predictions of Noyori's model.
-
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115
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2442656574
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a) B. Scheiper, M. Bonnekessel, H. Krause, A. Fürstner, J. Org. Chem. 2004. 69, 3943-3949;
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Scheiper, B.1
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116
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33645683634
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b) for a mechanistic study of this transformation see: A. Fürstner, H. Krause, C. W. Lehmann, Angew. Chem. 2006, 118, 454-458:
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Fürstner, A.1
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b) A. Fürstner, A. Leitner, M. Méndez, H. Krause. J. Am. Chem. Soc. 2002, 124, 13856-13863;
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Fürstner, A.1
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0344012926
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Angew. Chem. Int. Ed. 2003, 42, 5355-5357;
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24644523532
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e) A. Fürstner, R. Martin, K. Majima, J. Am. Chem. Soc. 2005, 127, 12236-12237;
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f) A. Fürstner, A. Leitner, G. Seidel, Org. Synth. 2005, 81, 33-42.
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b) A. Fürstner, D. De Souza, L. Parra-Rapado, J. T. Jensen, Angew. Chem. 2003, 115, 5516-5518;
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138
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0037123194
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As such, compound 30 constitutes the nor-ketone of 6-epi-cubebene, a natural product that was isolated only recently from the essential oils of Solidago canadensis, see: A. A. Kasali, O. Ekundayo, C. Paul, W. A. König, Phytochemistry 2002, 59, 805-810.
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Kasali, A.A.1
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Paul, C.3
König, W.A.4
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139
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-
33645671486
-
-
note
-
It should be noted, however, that these data do not allow us to conclude that it is the only pathway that is operative; at least theoreti cally, the possibility remains that both pathways are populated to some extent.
-
-
-
-
140
-
-
33645695864
-
-
note
-
For an example of a gold-catalyzed skeletal rearrangement in which the stereochemistry of the substrate affects the outcome of the reaction see ref. [12f].
-
-
-
-
141
-
-
33645684656
-
-
note
-
A related approach to the carene family has been published after our preliminary communication (ref. [15]) although the natural products per se have not been prepared, see ref. [4b].
-
-
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143
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0002846635
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For previous entries into the carane family by α-diazoketone cyclizations see: a) R. M. Coates, R. M. Freidinger, Tetrahedron 1970, 26, 3487-3493;
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Coates, R.M.1
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149
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0001711588
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g) see also: E. J. Corey, K. Achiwa, J. A. Katzenellenbogen, J. Am. Chem. Soc. 1969, 91, 4318-4320;
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Corey, E.J.1
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h) J. J. Plattner, U. T. Bhalerao, H. Rapoport, J. Am. Chem. Soc. 1969, 91, 4933-4934.
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Plattner, J.J.1
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151
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0011906205
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For syntheses of carene terpenoids employing other methods see the following for representative examples: a) C. R. Johnson. J. F. Kadow J. Org. Chem. 1987, 52, 1493-1500;
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Johnson, C.R.1
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33645691168
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c) T. Uyehara, K. Ogata, J. Yamada, T. Kato, J. Chem. Soc. Chem. Commun. 1983, 17-18;
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Uyehara, T.1
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d) K. Kitatani, T. Hiyama, H. Nozaki, J. Am. Chem. Soc. 1976, 98, 2362-2364;
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Kitatani, K.1
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155
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0025327527
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and references therein
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e) M. Franck-Neumann, P. Geoffroy, M. Miesch, F. Zaragoza-Dörwald, Tetrahedron Lett. 1990, 31, 4121-4124 and references therein.
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Franck-Neumann, M.1
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156
-
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33645693430
-
-
note
-
Although two consecutive acetyl migrations via intermediates such as B and C could also explain the formation of the allenyl acetate 34, previous literature reports generally assume a [3,3]-sigmatropic pathway for reactions of this type, see ref. [48].
-
-
-
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157
-
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33645658395
-
-
note
-
6.
-
-
-
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158
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84985111128
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For precedence see: a) U. Koch-Pomeranz, H.-J. Hansen, H. Schmid, Helv. Chim. Acta 1973, 56, 2981-3004;
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Koch-Pomeranz, U.1
Hansen, H.-J.2
Schmid, H.3
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159
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4544250515
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and references therein
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b) K. Cariou, E. Mainetti, L. Fensterbank, M. Malacria, Tetrahedron 2004, 60, 9745-9755 and references therein.
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Cariou, K.1
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160
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0009170092
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K. M. Saplay, R. Sahni, N. P. Damodaran, S. Dev, Tetrahedron 1980, 36, 1455-1461.
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Saplay, K.M.1
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Damodaran, N.P.3
Dev, S.4
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161
-
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33645674921
-
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note
-
Other conceivable methods for the dehydration of alcohol 37 gave much more complex product mixtures.
-
-
-
-
163
-
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33645673484
-
-
note
-
3N as hydride sources led to somewhat lower yields in this particular transformation (60 and 41 %, respectively).
-
-
-
-
165
-
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0008795544
-
-
It is worth mentioning that isosequicarene, a natural product isolated from Haplopappus tenuisectus, shows this particular configuration at C-7 but has a 3-carene rather than a 2-carene core, see: T. Uyehara, J. Yamada, T. Kato, F. Bohlmann, Bull. Chem. Soc. Jpn. 1985, 58, 861-867.
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Uyehara, T.1
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Bohlmann, F.4
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