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For ureas as Lewis bases, see: a) I. Chataigner, U. Piarulli, C. Gennari, Tetrahedron Lett. 1999, 40, 3633; for triphenylphosphine oxide as a Lewis base, see: b) J. D. Short, S. Attenoux, D. J. Berrisford, Tetrahedron Lett. 1997, 38, 2351; sulfoxides as Lewis bases: c) G. J. Rowlands, W. K. Barnes, Chem. Commun. 2003, 2712; d) A. Massa, A. V. Malkov, P. Kocovsky, A. Scettri, Tetrahedron Lett. 2003, 44, 7179 (correction: Tetrahedron Lett. 2003, 44, 9067).
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84888934453
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note
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Allyltrichlorosilanes are nucleophiles and at the same time work as Lewis acids, and therefore it can be considered that NCOs activate both nucleophiles and Lewis acids.
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For reviews, see: a) J. A. Marshall, Chemtracts: Org Chem. 1998, 11; b) M. Nakajima, J. Synth. Org. Chem. Jpn. 2000, 58, 839; c) S. E. Denmark, J. Fu, Chem. Commun. 2003, 167; d) S. E. Denmark, J. Fu, Chem. Rev. 2003, 103, 2763.
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Based on this definition, several amines which activate nucleophiles in addition to carbonyl and related compounds are classified into NCOs. In these cases, while the molecules are uncharged and neutral, reaction mixtures would be somehow basic. Other terms, "external (chiral) ligand control" or "(chiral) coordinating agents," have been used for the same category of the catalysis, see: a) K. Tomioka, Synthesis 1990, 541; b) K. Tomioka, M. Hasegawa, J. Synth. Org. Chem. Jpn. 2000, 58, 24; c) H. Doi, T. Sakai, M. Iguchi, K. Yamada, K. Tomioka, J. Am. Chem. Soc. 2003, 125, 2886, and references cited therein; d) K. Tomooka, J. Synth. Org. Chem. Jpn. 2001, 59, 322; e) K. Tomooka, K. Yamamoto, T. Nakai, Angew. Chem. Int. Ed. 1999, 38, 3741, and references cited therein.
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84888963895
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Based on this definition, several amines which activate nucleophiles in addition to carbonyl and related compounds are classified into NCOs. In these cases, while the molecules are uncharged and neutral, reaction mixtures would be somehow basic. Other terms, "external (chiral) ligand control" or "(chiral) coordinating agents," have been used for the same category of the catalysis, see: a) K. Tomioka, Synthesis 1990, 541; b) K. Tomioka, M. Hasegawa, J. Synth. Org. Chem. Jpn. 2000, 58, 24; c) H. Doi, T. Sakai, M. Iguchi, K. Yamada, K. Tomioka, J. Am. Chem. Soc. 2003, 125, 2886, and references cited therein; d) K. Tomooka, J. Synth. Org. Chem. Jpn. 2001, 59, 322; e) K. Tomooka, K. Yamamoto, T. Nakai, Angew. Chem. Int. Ed. 1999, 38, 3741, and references cited therein.
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and references cited therein
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Based on this definition, several amines which activate nucleophiles in addition to carbonyl and related compounds are classified into NCOs. In these cases, while the molecules are uncharged and neutral, reaction mixtures would be somehow basic. Other terms, "external (chiral) ligand control" or "(chiral) coordinating agents," have been used for the same category of the catalysis, see: a) K. Tomioka, Synthesis 1990, 541; b) K. Tomioka, M. Hasegawa, J. Synth. Org. Chem. Jpn. 2000, 58, 24; c) H. Doi, T. Sakai, M. Iguchi, K. Yamada, K. Tomioka, J. Am. Chem. Soc. 2003, 125, 2886, and references cited therein; d) K. Tomooka, J. Synth. Org. Chem. Jpn. 2001, 59, 322; e) K. Tomooka, K. Yamamoto, T. Nakai, Angew. Chem. Int. Ed. 1999, 38, 3741, and references cited therein.
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Based on this definition, several amines which activate nucleophiles in addition to carbonyl and related compounds are classified into NCOs. In these cases, while the molecules are uncharged and neutral, reaction mixtures would be somehow basic. Other terms, "external (chiral) ligand control" or "(chiral) coordinating agents," have been used for the same category of the catalysis, see: a) K. Tomioka, Synthesis 1990, 541; b) K. Tomioka, M. Hasegawa, J. Synth. Org. Chem. Jpn. 2000, 58, 24; c) H. Doi, T. Sakai, M. Iguchi, K. Yamada, K. Tomioka, J. Am. Chem. Soc. 2003, 125, 2886, and references cited therein; d) K. Tomooka, J. Synth. Org. Chem. Jpn. 2001, 59, 322; e) K. Tomooka, K. Yamamoto, T. Nakai, Angew. Chem. Int. Ed. 1999, 38, 3741, and references cited therein.
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Based on this definition, several amines which activate nucleophiles in addition to carbonyl and related compounds are classified into NCOs. In these cases, while the molecules are uncharged and neutral, reaction mixtures would be somehow basic. Other terms, "external (chiral) ligand control" or "(chiral) coordinating agents," have been used for the same category of the catalysis, see: a) K. Tomioka, Synthesis 1990, 541; b) K. Tomioka, M. Hasegawa, J. Synth. Org. Chem. Jpn. 2000, 58, 24; c) H. Doi, T. Sakai, M. Iguchi, K. Yamada, K. Tomioka, J. Am. Chem. Soc. 2003, 125, 2886, and references cited therein; d) K. Tomooka, J. Synth. Org. Chem. Jpn. 2001, 59, 322; e) K. Tomooka, K. Yamamoto, T. Nakai, Angew. Chem. Int. Ed. 1999, 38, 3741, and references cited therein.
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Isomerization of homoallylic alcohols under Lewis acidic conditions has been reported: a) J. Nokami, K. Yoshizane, H. Matsuura, S. Sumida, J. Am. Chem. Soc. 1998, 120, 6609; b) S. Sumida, M. Ohga, J. Mitani, J. Nokami, J. Am. Chem. Soc. 2000, 122, 1310.
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84888979744
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The coordination form of DMF is not yet clear at this stage
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The coordination form of DMF is not yet clear at this stage.
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78
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0000660859
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It was reported that diastereoselecitivity of crotylation using B-crotyl-9-BBN was also sensitive to the nature of the imine, see: a) Y. Yamamoto, T. Komatsu, K. Maruyama, J. Org. Chem. 1985, 50, 3115; crotylboration of oximines showed the same stereospecificity (from E to anti and from Z to syn), see: b) R. W. Hoffmann, A. Endesfelder, Liebigs Ann. Chem. 1987, 215; syn-selective crotylstannation of imines, see: c) G. E. Keck, E. Enholm, J. Org. Chem. 1985, 50, 146; fluoride-promoted crotylation of imines with crotyltrifluorosilane showed low stereoselectivity, see: d) M. Kira, T. Hino, H. Sakurai, Chem. Lett. 1991, 277.
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79
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It was reported that diastereoselecitivity of crotylation using B-crotyl-9-BBN was also sensitive to the nature of the imine, see: a) Y. Yamamoto, T. Komatsu, K. Maruyama, J. Org. Chem. 1985, 50, 3115; crotylboration of oximines showed the same stereospecificity (from E to anti and from Z to syn), see: b) R. W. Hoffmann, A. Endesfelder, Liebigs Ann. Chem. 1987, 215; syn-selective crotylstannation of imines, see: c) G. E. Keck, E. Enholm, J. Org. Chem. 1985, 50, 146; fluoride-promoted crotylation of imines with crotyltrifluorosilane showed low stereoselectivity, see: d) M. Kira, T. Hino, H. Sakurai, Chem. Lett. 1991, 277.
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It was reported that diastereoselecitivity of crotylation using B-crotyl-9-BBN was also sensitive to the nature of the imine, see: a) Y. Yamamoto, T. Komatsu, K. Maruyama, J. Org. Chem. 1985, 50, 3115; crotylboration of oximines showed the same stereospecificity (from E to anti and from Z to syn), see: b) R. W. Hoffmann, A. Endesfelder, Liebigs Ann. Chem. 1987, 215; syn-selective crotylstannation of imines, see: c) G. E. Keck, E. Enholm, J. Org. Chem. 1985, 50, 146; fluoride-promoted crotylation of imines with crotyltrifluorosilane showed low stereoselectivity, see: d) M. Kira, T. Hino, H. Sakurai, Chem. Lett. 1991, 277.
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It was reported that diastereoselecitivity of crotylation using B-crotyl-9-BBN was also sensitive to the nature of the imine, see: a) Y. Yamamoto, T. Komatsu, K. Maruyama, J. Org. Chem. 1985, 50, 3115; crotylboration of oximines showed the same stereospecificity (from E to anti and from Z to syn), see: b) R. W. Hoffmann, A. Endesfelder, Liebigs Ann. Chem. 1987, 215; syn-selective crotylstannation of imines, see: c) G. E. Keck, E. Enholm, J. Org. Chem. 1985, 50, 146; fluoride-promoted crotylation of imines with crotyltrifluorosilane showed low stereoselectivity, see: d) M. Kira, T. Hino, H. Sakurai, Chem. Lett. 1991, 277.
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high 1,2-asymmetric induction in the reaction of an allylic boron reagent with chiral imines is explained by a similar transition state, see: c) Y. Yamamoto, S. Nishii, K. Maruyama, T. Komatsu, W. Itoh, J. Am. Chem. Soc. 1986, 108, 7778.
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84888980902
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[7b,10a,12c,d]
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[7b,10a,12c,d]
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92
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0141508049
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For a recent review on chiral sulfoxides in organic synthesis, see: Fernádez, N. Khair, Chem. Rev. 2003, 103, 3651.
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0001272894
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For Pummerer rearrangement, see: O. D. Lucci, Organic Reactions 1991, 40, 157; for racemization of optically active sulfoxides, see: a) K. Mislow, T. Simmons, J. T. Mellilo, A. L. Ternay, Jr., J. Am. Chem. Soc. 1964, 86, 1452; b) G. Modena, U. Quintily, G. Scorrano, J. Am. Chem. Soc. 1972, 94, 202.
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Lucci, O.D.1
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0001384218
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For Pummerer rearrangement, see: O. D. Lucci, Organic Reactions 1991, 40, 157; for racemization of optically active sulfoxides, see: a) K. Mislow, T. Simmons, J. T. Mellilo, A. L. Ternay, Jr., J. Am. Chem. Soc. 1964, 86, 1452; b) G. Modena, U. Quintily, G. Scorrano, J. Am. Chem. Soc. 1972, 94, 202.
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For Pummerer rearrangement, see: O. D. Lucci, Organic Reactions 1991, 40, 157; for racemization of optically active sulfoxides, see: a) K. Mislow, T. Simmons, J. T. Mellilo, A. L. Ternay, Jr., J. Am. Chem. Soc. 1964, 86, 1452; b) G. Modena, U. Quintily, G. Scorrano, J. Am. Chem. Soc. 1972, 94, 202.
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Modena, G.1
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97
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84888945764
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[12b]
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[12b]
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100
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0141619399
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For a recent review on polymer-supported organic catalysts, see: M. Beraglia, A. Puglisi, F. Cozzi, Chem. Rev. 2003, 103, 3401.
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