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4544261474
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submitted for publication
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In our hands, oligomeric products have been identified during the conjugate addition of lithium amides to tert-butyl 2,5-dihydrofuran-3- carboxylate. See: Bunnage, M. E.; Davies, S. G.; Roberts, P. M.; Smith, A. D.; Withey, J. M.; Org. Biomol. Chem.; 2004, submitted for publication.
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Org. Biomol. Chem.
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Bunnage, M.E.1
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Roberts, P.M.3
Smith, A.D.4
Withey, J.M.5
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29
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4544330570
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note
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The configuration of the minor diastereoisomer arising from this three-component coupling is unknown but is not identical to either diastereoisomer obtained from the stepwise [2+1] reaction manifold.
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30
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0001654882
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Costello, J. F.; Davies, S. G.; Ichihara, O. Tetrahedron: Asymmetry 1994, 5, 3919.
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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Schmidt, H.-J.2
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36
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0000625441
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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Wittig, G.1
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0001484561
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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4544247660
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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Burchill, M.T.2
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33747022718
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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Majewski, M.1
Gleave, D.M.2
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40
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0000307329
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A minor reaction product in the preparation of 14 and 15 was diethyl (E)-cinnamyl malonate, isolated in 19% and 15% yield (with respect to diethyl phenylallylidenemalonate), respectively, which arises from in situ conjugate reduction by lithium amide (S)-1. For selected examples of lithium amides acting as reducing agents see: (a) Wittig, G.; Schmidt, H.-J.; Renner, H. Chem. Ber. 1962, 95, 2377. (b) Wittig, G.; Frommeld, H.-D. Chem. Ber. 1964, 97, 3541. (c) Scott, L. T.; Carlin, K. J.; Schultz, T. H. Tetrahedron Lett. 1978, 19, 4637. (d) Newcomb, M.; Burchill, M. T. J. Am. Chem. Soc. 1984, 106, 2450. (e) Majewski, M.; Gleave, D. M. J. Organomet. Chem. 1994, 470, 1. (f) Takeda, K.; Ohnishi, Y.; Koizumi, T. Org. Lett. 1999, 1, 237.
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Takeda, K.1
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41
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4544374254
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note
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1 = 0.0253 [I>3σ(I)]. Crystallographic data (excluding structure factors) has been deposited with the Cambridge Crystallographic Data Centre as supplementary publication number CCDC240141. Copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge, CB2 1EZ, UK [fax: 444 (1223)336033 or e-mail: deposit@ccdc.cam.ac.uk].
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