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1
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33846965468
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Barcelona, Spain, April 25-28, 2005
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Parts of this investigation were presented at the 11th International Conference of Organic Process Research & Development, Budapest, Hungary, September 3-8
-
Parts of this investigation were presented at the 11th International Conference of Organic Process Research & Development, Barcelona, Spain, April 25-28, 2005, and at the XVI Fechem Conference on Organometallic Chemistry, Budapest, Hungary, September 3-8, 2005.
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(2005)
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EP 0743297, priority 16.5.1995 to Givaudan [Chem. Abstr. 126, 103856h
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Bajgrowicz, J; Bringhen, A; Fráter, G; Müller, U. EP 0743297, priority 16.5.1995 to Givaudan [Chem. Abstr. 126, 103856h].
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(a) Erman, M. B.; Hoffmann, H. M.; Cardenas, C. G. EP 0985651, priority 16.8.1998 to Millenium Speciality Chemicals, Inc. [Chem. Abstr. 132, 207981k].
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(b) Erman, M. B.; Williams, M. J.; Cardenas, C. G. WO 200160777, priority 18.2.2000 to Millenium Speciality Chemicals, Inc. [Chem. Abstr. 135, 197197e].
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San Francisco, April 13-17, American Chemical Society: Washington, D.C
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(a) Fráter, G.; Müller, U.; Nussbaumer, C. Book of Abstracts; 213th National Meeting of the American Chemical Society, San Francisco, April 13-17, 1997; American Chemical Society: Washington, D.C., 1997.
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33846969052
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Barras, J.-P.; Schröder, F. WO 2005016938, priority 18.8.2003 to Givaudan [Chem. Abstr. 142, 219409z].
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Eschenmoser, A.; Felix, D.; Gut, M.; Meier, J.; Stadler, P. in CIBA Foundation Symposium on the Biosynthesis of Terpenes and Steroids; Wolstenholme, G. E. W., O'Connor, M., Eds.; J. & A. Churchill: London, UK, 1959; p 217.
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33846990002
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33846949936
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36
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33846990330
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Markovnikov addition of formic acid to trisubstituted double bonds and re-elimination: Baird, K. J.; Grundon, M. F.; Harrison, D. M.; Magee, M. G. Heterocycles 1981, 713-717.
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(a) Markovnikov addition of formic acid to trisubstituted double bonds and re-elimination: Baird, K. J.; Grundon, M. F.; Harrison, D. M.; Magee, M. G. Heterocycles 1981, 713-717.
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37
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2742607165
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Addition of phosphoric acid: Julia, M.; Mestdagh, H.; Rolando, C. Tetrahedron 1986, 42, 3841-3849. HX addition and re-elimination was observed by us when bubbling HCl or HBr through precursor 5 (GC/MS), where after attempted isolation of these halides the partially isomerized mixtures 7, 8 were obtained after chromatography or distillation.
-
(b) Addition of phosphoric acid: Julia, M.; Mestdagh, H.; Rolando, C. Tetrahedron 1986, 42, 3841-3849. HX addition and re-elimination was observed by us when bubbling HCl or HBr through precursor 5 (GC/MS), where after attempted isolation of these halides the partially isomerized mixtures 7, 8 were obtained after chromatography or distillation.
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38
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33846950706
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This hypothesis represents so far the best answer to the important question, why Brønsted acids induce preisomerization and strong, active LA's do not. We also considered an inductive deactivation of the cyclohexenyl double bond depending on the strength of the carbonyl group/acid complex. Although we could not find a well-proven precedent for a deactivation over three σ-bonds, such an effect cannot be excluded
-
This hypothesis represents so far the best answer to the important question, why Brønsted acids induce preisomerization and strong, active LA's do not. We also considered an inductive deactivation of the cyclohexenyl double bond depending on the strength of the carbonyl group/acid complex. Although we could not find a well-proven precedent for a deactivation over three σ-bonds, such an effect cannot be excluded.
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0001526266
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(a) Zhang, J.-H.; Wang, M.-X.; Huang, Z.-T. J. Chem. Soc., Perkin Trans. 1 1999, 2087-2094.
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37049039981
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Baddeley, G.; Heaton, B. G; Rasburn, J. W. J. Chem. Soc. 1960, 4713-4719. As in our case (12, 15) the formation of an endocyclic enol ether was not possible, due to the fully substituted endocyclic α-position.
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43
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33846953071
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Alkynol 26 also can be prepared from Dehydro-β-linalol (CAS 29171-20.-8) by using the 3-step procedure described by Glänzer: Glänzer, B. I.; Faber, K.; Griengl, H. Tetrahedron 1978, 43, 5791-5796.
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Alkynol 26 also can be prepared from Dehydro-β-linalol (CAS 29171-20.-8) by using the 3-step procedure described by Glänzer: Glänzer, B. I.; Faber, K.; Griengl, H. Tetrahedron 1978, 43, 5791-5796.
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33846971863
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We cannot exclude that backside shielding of the α-face of 25 by the isohexenyl side chain, probably favored by π-stacking in analogy to Figure 3, is solely responsible for this preference
-
We cannot exclude that backside shielding of the α-face of 25 by the isohexenyl side chain, probably favored by π-stacking (in analogy to Figure 3), is solely responsible for this preference.
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51
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33846951698
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a units: (a) Yamamoto, H.; Futatsugi, K. Angew. Chem., Int. Ed. 2005, 44, 1924-1942.
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2 have also been used successfully in reactions such as Cycloalkylation, intramolecular Diels-Alder, epoxide-initiated cation-olefin cyclization, aldol condensation, carbocationic cyclization of unsaturated carbonyl compounds, and carbonyl ene reactions. See, for example: (a) Abouabdellah, A.; Bonnet-Delpon, D. Tetrahedron 1994, 50 11921-11932.
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2 have also been used successfully in reactions such as Cycloalkylation, intramolecular Diels-Alder, epoxide-initiated cation-olefin cyclization, aldol condensation, carbocationic cyclization of unsaturated carbonyl compounds, and carbonyl ene reactions. See, for example: (a) Abouabdellah, A.; Bonnet-Delpon, D. Tetrahedron 1994, 50 11921-11932.
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