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(b) Trost B. M.; Fleming I., Eds. Pergamon Press: Oxford
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(g) Dondoni, A.; Marra, A.; Massi, A. Tetrahedron 1998, 54, 2827-2832;
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(i) Lieberknecht, A.; Griesser, H.; Bravo, R. D.; Colinas, P. A.; Grigera, R. J. Tetrahedron 1998, 54, 3159-3168.
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Grigera, R.J.5
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(d) Heys, L.; Murphy, P. J.; Coles, S. J.; Gelbrich, T.; Hursthouse, M. B. Tetrahedron Lett. 1999, 40, 7151-7152.
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Heys, L.1
Murphy, P.J.2
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(a) Lakhrissi, M.; Chapleur, Y. Angew. Chem., Int. Ed. Engl. 1996, 35, 750-752;
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Lakhrissi, M.1
Chapleur, Y.2
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27
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0032497604
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See also Ref. 20.
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An interesting application of our olefination procedure to aminosugar derived lactones has been reported recently: Molina, A.; Czernecki, S.; Xie, J. Tetrahedron Lett. 1998, 39, 7507-7510. See also Ref. 20.
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Tetrahedron Lett.
, vol.39
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Molina, A.1
Czernecki, S.2
Xie, J.3
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28
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0025959623
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See also Ref. 3i.
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For other approaches to enol ether from lactones see Csuk, R.; Glanzer, B. I. Tetrahedron 1991, 47, 1655-1664. See also Ref. 3i.
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(1991)
Tetrahedron
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Csuk, R.1
Glanzer, B.I.2
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29
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0033588316
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For other approaches to enol ether from thionolactones, see Lee, H. K.; Kim, J.; Pak, C. S. Tetrahedron Lett. 1999, 40, 6267-6270.
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Tetrahedron Lett.
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, pp. 6267-6270
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Lee, H.K.1
Kim, J.2
Pak, C.S.3
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30
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0033593319
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Maybe inspired by our work, one example of Wittig olefination of the carbonyl group of oxazolidinone derived from aminoacids in toluene without racemization has been reported: Reddy, G. V.; Rao, G. V.; Iyengar, D. S. Tetrahedron Lett. 1999, 40, 775-776.
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(1999)
Tetrahedron Lett.
, vol.40
, pp. 775-776
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Reddy, G.V.1
Rao, G.V.2
Iyengar, D.S.3
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31
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0012508854
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Horner Emmons olefination of lactone 2 using cyanomethylene diethyl phosphonate and NaH or potassium t-butoxide, the latter giving best results, yielded 35 to 50% of a E:Z 1:2 mixture of olefins 3.
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Schiemenz, G. P.; Engelhard, H. Chem. Ber. 1961, 94, 578-584. Horner Emmons olefination of lactone 2 using cyanomethylene diethyl phosphonate and NaH or potassium t-butoxide, the latter giving best results, yielded 35 to 50% of a E:Z 1:2 mixture of olefins 3. For the use of this reagent in the olefination of valerolactone, see Dugan, A. J.; Adams, M. A.; Brynes, P. J.; Meinwald, J. Tetrahedron Lett. 1978, 4323-4326.
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(1961)
Chem. Ber.
, vol.94
, pp. 578-584
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Schiemenz, G.P.1
Engelhard, H.2
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32
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0002406453
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Schiemenz, G. P.; Engelhard, H. Chem. Ber. 1961, 94, 578-584. Horner Emmons olefination of lactone 2 using cyanomethylene diethyl phosphonate and NaH or potassium t-butoxide, the latter giving best results, yielded 35 to 50% of a E:Z 1:2 mixture of olefins 3. For the use of this reagent in the olefination of valerolactone, see Dugan, A. J.; Adams, M. A.; Brynes, P. J.; Meinwald, J. Tetrahedron Lett. 1978, 4323-4326.
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(1978)
Tetrahedron Lett.
, pp. 4323-4326
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Dugan, A.J.1
Adams, M.A.2
Brynes, P.J.3
Meinwald, J.4
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33
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0342771294
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note
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Typical procedures for the Wittig reaction are as follows: (a) Using reflux conditions: to a solution of lactone (1 mmol) in 15 ml toluene was added (cyanomethylene) triphenylphosphorane (1.20 g, 4 mmol). The mixture was heated under reflux for the indicated time, concentrated and purified on silica gel; (b) Under microwave activation: the heterogeneous mixture of the substrate (0.5 mmol) in dry toluene (2.5 ml) was placed in a 10 ml Pyrex bottle. The bottle was then hermetically closed with a teflon screw cap (to prevent evaporation of the solvent) and subjected to microwave irradiation in a commercial microwave oven (operating at 2450 MHz) for 2 min. After this heating, a period of 30 s was allowed for cooling and the process was repeated for another 2 min. After removal of the solvent column chromatography gave pure C-glycosylidene compounds.
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34
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0031683652
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Loupy, A.; Petit, A.; Hamelin, J.; Texier-Boullet, F.; Jacquault, P.; Mathe, D. Synthesis 1998, 1213-1234.
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(1998)
Synthesis
, pp. 1213-1234
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Loupy, A.1
Petit, A.2
Hamelin, J.3
Texier-Boullet, F.4
Jacquault, P.5
Mathe, D.6
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35
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0032890214
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While this work was in progress, successful Wittig olefination of some lactones and hydrazides using microwave activation was reported: Sabitha, G.; Reddy, M. M.; Srinivas, D.; Yadov, J. S. Tetrahedron Lett. 1999, 40, 165-166.
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(1999)
Tetrahedron Lett.
, vol.40
, pp. 165-166
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-
Sabitha, G.1
Reddy, M.M.2
Srinivas, D.3
Yadov, J.S.4
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36
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0342336334
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note
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To a solution of the C-glycosylidene compound (0.5 mmol) in dry MeOH (15 ml) was added 10% palladium on charcoal (80 mg) and the mixture was stirred under hydrogen atmosphere for 16 h at room temperature. The catalyst was filtered off on Celite and the filtrate concentrated. The crude product was purified on silica gel.
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38
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0033411661
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Xie, J.; Molina, A.; Czernecki, S. J. Carbohydr. Chem. 1999, 18, 481-498.
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(1999)
J. Carbohydr. Chem.
, vol.18
, pp. 481-498
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Xie, J.1
Molina, A.2
Czernecki, S.3
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