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26844437116
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Synthesis of sulfones 3 and 4 will be published elsewhere
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Synthesis of sulfones 3 and 4 will be published elsewhere.
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32
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26844540676
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In comparative experiments, the reaction of the anion derived from 4-desmethylsulfone analogue of 3 with benzaldehyde or 3-phenylpropionaldehyde led to the expected condensation products in 80-85% yields
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In comparative experiments, the reaction of the anion derived from 4-desmethylsulfone analogue of 3 with benzaldehyde or 3-phenylpropionaldehyde led to the expected condensation products in 80-85% yields.
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33
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0000898481
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This chiral aldehyde was synthesized by ozonolysis of the corresponding Hoppe's homoaldolisation vinylcarbamate adduct prepared for other synthetic work in our laboratories (unpublished results), see Hoppe, D.; Hanko, R.; Brönneke, A.; Lichtenberg, F.; van Hülsen, E. Chem. Ber. 1985, 118, 2822.
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Hoppe, D.1
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Van Hülsen, E.5
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34
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26844531931
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Hydroxysulfones 6a,b were obtained as 3:1 and 1:1 diastereomeric mixtures respectively whereas the corresponding lactones 7a,b were obtained as 2:1 and 6:5 mixtures. Interestingly, lactone 7c only exists as a ca. 2:1 diastereomeric mixture which probably indicates an efficient diastereoselective Felkin-Ahn controlled condensation
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Hydroxysulfones 6a,b were obtained as 3:1 and 1:1 diastereomeric mixtures respectively whereas the corresponding lactones 7a,b were obtained as 2:1 and 6:5 mixtures. Interestingly, lactone 7c only exists as a ca. 2:1 diastereomeric mixture which probably indicates an efficient diastereoselective Felkin-Ahn controlled condensation.
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35
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3242892786
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Obtention of δ-lactones after condensation of dianions derived from 4-(phenylsulfonyl)butanoic acid on aldehydes followed by acidic work-up has been precedented whereas the course of the subsequent Na/Hg reductive elimination step has been shown to involve an initial methanolysis of the lactone function, a fact which has not been observed in our examples : Thompson, C. M.; Frick, J. A. J. Org. Chem., 1989, 54, 890.
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Frick, J.A.2
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36
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0000693748
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and references cited therein
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Keck, G. E.; Savin, K. A.; Weglarz, M. A. J. Org. Chem. 1995, 60, 3194 and references cited therein.
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0001298033
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4344650647
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Ihara, M.; Suzuki, S.; Taniguchi, S.; Tokunaga, Y.; Fukumoto, K. Synlett 1994, 859.
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Ihara, M.1
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Fukumoto, K.5
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41
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26844539867
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note
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2O as above.
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42
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26844561456
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Calculations including molecular dynamics minimisations via MM2 force fields, MOPAC semi-empirical calculations (MINDO/3) and Monte Carlo research of conformers have been carried out with Macromodel V5.0 (Columbia University) and CS Chemdraw 3D Pro softwares (with H or Me instead of Na when this later was unparametrized).
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Calculations including molecular dynamics minimisations via MM2 force fields, MOPAC semi-empirical calculations (MINDO/3) and Monte Carlo research of conformers have been carried out with Macromodel V5.0 (Columbia University) and CS Chemdraw 3D Pro softwares (with H or Me instead of Na when this later was unparametrized).
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43
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33748974766
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Some of these arguments have been claimed to explain the reactivity of anomeric anions derived from samarium: Mazéas, D.; Skrydstrup, T.; Beau, J. M. Angew. Chem., Int. Ed. Engl 1995, 34, 909.
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(1995)
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Mazéas, D.1
Skrydstrup, T.2
Beau, J.M.3
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