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(a) Pérez Luna, A.; Ceschi, M.-A.; Bonin, M.; Micouin, L.; Husson, H.-P.; Gougeon, S.; Estenne-Bouhtou, G.; Marabout, B.; Sevrin, M.; George, P. J. Org. Chem. 2002, 67, 3522.
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(a) Yao, M.-L.; Adiwidjaja, G.; Kaufmann, D. E. Angew. Chem., Int. Ed. 2002, 41, 3375.
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For alternative routes to hydrazinocyclopentanes, see: (b) Tauh, P.; Fallis, A. G. J. Org. Chem. 1999, 64, 6960. (c) Marco-Contelles, J.; Rodriguez, M. Tetrahedron Lett. 1998, 39, 6749.
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For alternative routes to hydrazinocyclopentanes, see: (b) Tauh, P.; Fallis, A. G. J. Org. Chem. 1999, 64, 6960. (c) Marco-Contelles, J.; Rodriguez, M. Tetrahedron Lett. 1998, 39, 6749.
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Rodriguez, M.2
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0034598038
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WO 96/4068
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Although an impressive number of carbocyclic nucleosides syntheses have been described, reports on the preparation of such derivatives bearing pyrazoles or fused heterocyclic pyrazoles are scarce; see ref 7 and: Bhagwat, S.; Cowart, M. D. WO 96/4068. For examples of the usefulness of hydrazinocyclopentanes in the synthesis of bioactive compounds, see: Kuang, R.; Ganguly, A. K.; Chan, T.-M.; Pramanik, B. N.; Blythin, D. J.; McPhail, A. T.; Saksena, A. K. Tetrahedron Lett. 2000, 41, 9575 and references therein.
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Bhagwat, S.1
Cowart, M.D.2
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19
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0034598038
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and references therein
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Although an impressive number of carbocyclic nucleosides syntheses have been described, reports on the preparation of such derivatives bearing pyrazoles or fused heterocyclic pyrazoles are scarce; see ref 7 and: Bhagwat, S.; Cowart, M. D. WO 96/4068. For examples of the usefulness of hydrazinocyclopentanes in the synthesis of bioactive compounds, see: Kuang, R.; Ganguly, A. K.; Chan, T.-M.; Pramanik, B. N.; Blythin, D. J.; McPhail, A. T.; Saksena, A. K. Tetrahedron Lett. 2000, 41, 9575 and references therein.
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Kuang, R.1
Ganguly, A.K.2
Chan, T.-M.3
Pramanik, B.N.4
Blythin, D.J.5
McPhail, A.T.6
Saksena, A.K.7
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Lectka, T.4
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23
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0347858127
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note
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2, 125 μL, 0.125 mmol) was added, and the mixture was stirred at room temperature for 2 h. Water (2 mL) was added next, and the organic layer was separated and concentrated. Purification by flash chromatography (cyclohexane/ethyl acetate = 70/30) afforded rac-6 as a colorless oil (50 mg, 73%).
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24
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0346598069
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Mackay, D.; Campbell, J. A.; Jennison, C. P. R. Can. J. Chem. 1970, 48, 81.
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Mackay, D.1
Campbell, J.A.2
Jennison, C.P.R.3
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25
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0347227931
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Mackay, D.; Pilger, C. W.; Wong, L. L. J. Org. Chem. 1973, 38, 2043.
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0003995267
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Negishi, E.-I., Ed.; Wiley: New York
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Murahashi, S.-I.; Imada Y, Handbook of Organopalladium Chemistry for Organic Synthesis; Negishi, E.-I., Ed.; Wiley: New York, 2002; Vol. 2, 1817.
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Murahashi, S.-I.1
Imada, Y.2
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27
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0035901642
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From allylic aziridines: Aggarwal, V. K.; Alonso, E.; Fang, G.; Ferrara, M.; Hynd, G.; Porcelloni, M. Angew. Chem., Int. Ed. 2001, 40, 1433. From azabicyclic substrates: (a) Katagiri, N.; Takebayashi, M.; Kokufuda, H.; Kaneko, C.; Kanehira, K.; Torihara, M. J. Org. Chem. 1997, 62, 2, 1580. Other metal-catalyzed enantioselective ring openings of azabicyclic derivatives have also been described, but consideration of their stereo- and regioselectivity led the authors to propose a mechanism not involving π-allyl species: (b) Lautens, M.; Hiebert, S.; Renaud, J.-L. Org. Lett. 2000, 2, 1971. (c) Lautens, M.; Fagnou, K.; Hiebert, S. Acc. Chem. Res. 2003, 36, 48.
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Angew. Chem., Int. Ed.
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Aggarwal, V.K.1
Alonso, E.2
Fang, G.3
Ferrara, M.4
Hynd, G.5
Porcelloni, M.6
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28
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0346598068
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From allylic aziridines: Aggarwal, V. K.; Alonso, E.; Fang, G.; Ferrara, M.; Hynd, G.; Porcelloni, M. Angew. Chem., Int. Ed. 2001, 40, 1433. From azabicyclic substrates: (a) Katagiri, N.; Takebayashi, M.; Kokufuda, H.; Kaneko, C.; Kanehira, K.; Torihara, M. J. Org. Chem. 1997, 62, 2, 1580. Other metal-catalyzed enantioselective ring openings of azabicyclic derivatives have also been described, but consideration of their stereo- and regioselectivity led the authors to propose a mechanism not involving π-allyl species: (b) Lautens, M.; Hiebert, S.; Renaud, J.-L. Org. Lett. 2000, 2, 1971. (c) Lautens, M.; Fagnou, K.; Hiebert, S. Acc. Chem. Res. 2003, 36, 48.
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Katagiri, N.1
Takebayashi, M.2
Kokufuda, H.3
Kaneko, C.4
Kanehira, K.5
Torihara, M.6
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29
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0000563324
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From allylic aziridines: Aggarwal, V. K.; Alonso, E.; Fang, G.; Ferrara, M.; Hynd, G.; Porcelloni, M. Angew. Chem., Int. Ed. 2001, 40, 1433. From azabicyclic substrates: (a) Katagiri, N.; Takebayashi, M.; Kokufuda, H.; Kaneko, C.; Kanehira, K.; Torihara, M. J. Org. Chem. 1997, 62, 2, 1580. Other metal-catalyzed enantioselective ring openings of azabicyclic derivatives have also been described, but consideration of their stereo- and regioselectivity led the authors to propose a mechanism not involving π-allyl species: (b) Lautens, M.; Hiebert, S.; Renaud, J.-L. Org. Lett. 2000, 2, 1971. (c) Lautens, M.; Fagnou, K.; Hiebert, S. Acc. Chem. Res. 2003, 36, 48.
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Org. Lett.
, vol.2
, pp. 1971
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Lautens, M.1
Hiebert, S.2
Renaud, J.-L.3
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30
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0037239379
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From allylic aziridines: Aggarwal, V. K.; Alonso, E.; Fang, G.; Ferrara, M.; Hynd, G.; Porcelloni, M. Angew. Chem., Int. Ed. 2001, 40, 1433. From azabicyclic substrates: (a) Katagiri, N.; Takebayashi, M.; Kokufuda, H.; Kaneko, C.; Kanehira, K.; Torihara, M. J. Org. Chem. 1997, 62, 2, 1580. Other metal-catalyzed enantioselective ring openings of azabicyclic derivatives have also been described, but consideration of their stereo- and regioselectivity led the authors to propose a mechanism not involving π-allyl species: (b) Lautens, M.; Hiebert, S.; Renaud, J.-L. Org. Lett. 2000, 2, 1971. (c) Lautens, M.; Fagnou, K.; Hiebert, S. Acc. Chem. Res. 2003, 36, 48.
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Acc. Chem. Res.
, vol.36
, pp. 48
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Lautens, M.1
Fagnou, K.2
Hiebert, S.3
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31
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0346598066
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note
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dppf: 1,1′-bis-(diphenylphosphino)ferrocene.
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32
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0347227932
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note
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2 (2.3 mg, 0.0063 mmol) and 1,1′-bis-(diphenylphosphino)-ferrocene (9.5 mg, 0.017 mmol) were placed in a Schlenk tube, dried under vacuum (0.1 mmHg) for 1 h, and then placed under argon. Freshly distilled THF (3 mL) was degassed and then added to the mixture at room temperature. The yellow solution was stirred for 30 min. 4 (96 mg, 0.26 mmol) and phenol (127.5 mg, 1.35 mmol) dissolved in THF (1 mL) were added. Next, NaH (60% dispersion in mineral oil, 8.1 mg, 0.2 mmol) was added and the solution was stirred at room temperature until TLC analysis indicated full conversion. After dilution with diethyl ether (5 mL), the mixture was washed with sodium hydroxide (1 M, 2 x 5 mL) and brine (5 mL) and concentrated. Purification by flash chromatography (cyclohexane/ethyl acetate = gradient) afforded 8a as a slowly crystallizing white solid (100 mg, 83%).
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33
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0346598064
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note
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See Supporting Information. PHOX: 2-[2(diphenylphosphino)-phenyl]-4- phenyl-4,5-dihydrooxazole. No conversion was obtained when using the classical Trost ligand 1,2-diaminocyclohexane-N,N′-bis(2′-diphenyl- phosphinobenzoyl).
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