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Volumn , Issue 5, 2003, Pages 615-618

Synthesis of isocryptolepine via a Pd-catalyzed 'amination-arylation' approach

Author keywords

Buchwald Hartwig amination; Intramolecular arylation; Isocryptolepine; Malaria; Palladium

Indexed keywords

2 CHLOROANILINE; 4 CHLOROQUINOLINE; 5 METHYL 5H INDOLO[3,2 C]QUINOLINE; ANILINE DERIVATIVE; ANTIMALARIAL AGENT; CRYPTOLEPINE DERIVATIVE; PALLADIUM; QUINOLINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0037263604     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2003-38364     Document Type: Article
Times cited : (107)

References (45)
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    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • Arcadi, A.1    Cacchi, S.2    Cassetta, A.3    Fabrizi, G.4    Parisi, L.M.5
  • 9
    • 0034074722 scopus 로고    scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
    • (2000) Synthesis , pp. 549
    • Mouaddib, A.1    Joseph, B.2    Hasnaoui, A.3    Mérour, J.-Y.4
  • 10
    • 0032953559 scopus 로고    scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
    • (1999) Synlett , pp. 620
    • Cacchi, S.1    Fabrizi, G.2    Pace, P.3    Marinelli, F.4
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    • 0031983679 scopus 로고    scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • 0029783957 scopus 로고    scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • Molina, A.1    Vaquero, J.J.2    Garcia-Navio, J.L.3    Alvarez-Builla, J.4    Pascual-Teresa, B.5    Gago, F.6    Rodrigo, M.M.7    Ballesteros, M.8
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    • 0029614868 scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • Trécourt, F.1    Mongin, F.2    Mallet, M.3    Quéguiner, G.4
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    • 0013163046 scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
    • (1992) Eur. J. Med. Chem. , vol.27 , pp. 301
    • Go, M.L.1    Ngiam, T.L.2    Phillipson, J.D.3    Kirby, G.C.4    O'Neill, M.J.5    Warhurst, D.C.6
  • 15
    • 0025262404 scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • Molina, P.1    Alajarin, M.2    Vidal, A.3
  • 16
    • 0001309269 scopus 로고
    • For the synthesis of 11H-indolo[3,2-c]quinolines see: (a) Arcadi, A.; Cacchi, S.; Cassetta, A.; Fabrizi, G.; Parisi, L. M. Synlett 2001, 1605. (b) Mouaddib, A.; Joseph, B.; Hasnaoui, A.; Mérour, J.-Y. Synthesis 2000, 549. (c) Cacchi, S.; Fabrizi, G.; Pace, P.; Marinelli, F. Synlett 1999, 620. (d) Go, M.-L.; Ngiam, T.-L.; Tan, A. L.-C.; Kuaha, K.; Wilairat, P. Eur. J. Pharm. Sci. 1998, 6, 19. (e) Molina, A.; Vaquero, J. J.; Garcia-Navio, J. L.; Alvarez-Builla, J.; Pascual-Teresa, B.; Gago; F.; Rodrigo, M. M.; Ballesteros, M. J. Org. Chem. 1996, 61, 5587. (f) Trécourt, F.; Mongin, F.; Mallet, M.; Quéguiner, G. Synth. Commun. 1995, 25, 4011. (g) Go, M. L.; Ngiam, T. L.; Phillipson, J. D.; Kirby, G. C.; O'Neill, M. J.; Warhurst, D. C. Eur. J. Med. Chem. 1992, 27, 301. (h) Molina, P.; Alajarin, M.; Vidal, A. Tetrahedron 1990, 46, 1063. (i) Dave, V.; Warnhoff, E. W. Tetrahedron 1975, 31, 1255.
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    • Dave, V.1    Warnhoff, E.W.2
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    • 3743113417 scopus 로고    scopus 로고
    • For recent reviews on the Buchwald-Hartwig reaction see: (a) Barañano, D.; Mann, G.; Hartwig, J. F. Curr. Org. Chem. 1997, 1, 287. (b) Frost, C. G.; Mendonça, P. J. Chem. Soc., Perkin Trans. 1 1998, 2615. (c) Hartwig, J. F. Angew. Chem. Int. Ed. 1998, 37, 2046. (d) Muci, A. R.; Buchwald, S. L. Top. Curr. Chem. 2002, 219, 131.
    • (1997) Curr. Org. Chem. , vol.1 , pp. 287
    • Barañano, D.1    Mann, G.2    Hartwig, J.F.3
  • 18
    • 33748656316 scopus 로고    scopus 로고
    • For recent reviews on the Buchwald-Hartwig reaction see: (a) Barañano, D.; Mann, G.; Hartwig, J. F. Curr. Org. Chem. 1997, 1, 287. (b) Frost, C. G.; Mendonça, P. J. Chem. Soc., Perkin Trans. 1 1998, 2615. (c) Hartwig, J. F. Angew. Chem. Int. Ed. 1998, 37, 2046. (d) Muci, A. R.; Buchwald, S. L. Top. Curr. Chem. 2002, 219, 131.
    • (1998) J. Chem. Soc., Perkin Trans. 1 , pp. 2615
    • Frost, C.G.1    Mendonça, P.2
  • 19
    • 0032541260 scopus 로고    scopus 로고
    • For recent reviews on the Buchwald-Hartwig reaction see: (a) Barañano, D.; Mann, G.; Hartwig, J. F. Curr. Org. Chem. 1997, 1, 287. (b) Frost, C. G.; Mendonça, P. J. Chem. Soc., Perkin Trans. 1 1998, 2615. (c) Hartwig, J. F. Angew. Chem. Int. Ed. 1998, 37, 2046. (d) Muci, A. R.; Buchwald, S. L. Top. Curr. Chem. 2002, 219, 131.
    • (1998) Angew. Chem. Int. Ed. , vol.37 , pp. 2046
    • Hartwig, J.F.1
  • 20
    • 3743113417 scopus 로고    scopus 로고
    • For recent reviews on the Buchwald-Hartwig reaction see: (a) Barañano, D.; Mann, G.; Hartwig, J. F. Curr. Org. Chem. 1997, 1, 287. (b) Frost, C. G.; Mendonça, P. J. Chem. Soc., Perkin Trans. 1 1998, 2615. (c) Hartwig, J. F. Angew. Chem. Int. Ed. 1998, 37, 2046. (d) Muci, A. R.; Buchwald, S. L. Top. Curr. Chem. 2002, 219, 131.
    • (2002) Top. Curr. Chem. , vol.219 , pp. 131
    • Muci, A.R.1    Buchwald, S.L.2
  • 21
    • 0001713836 scopus 로고
    • For examples on intramolecular Pd-catalyzed arylation of N-(o-bromoazaheteroaryl)anilines and N-azaheteroaryl-2-bromoanilines see: (a) Ames, D. E.; Bull, D. Tetrahedron 1982, 38, 383. (b) Iwaki, T.; Yasuhara, A.; Sakamoto, T. J. Chem. Soc., Perkin Trans. 1 1999, 1505.
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    • Ames, D.E.1    Bull, D.2
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    • 0000401303 scopus 로고    scopus 로고
    • For examples on intramolecular Pd-catalyzed arylation of N-(o-bromoazaheteroaryl)anilines and N-azaheteroaryl-2-bromoanilines see: (a) Ames, D. E.; Bull, D. Tetrahedron 1982, 38, 383. (b) Iwaki, T.; Yasuhara, A.; Sakamoto, T. J. Chem. Soc., Perkin Trans. 1 1999, 1505.
    • (1999) J. Chem. Soc., Perkin Trans. 1 , pp. 1505
    • Iwaki, T.1    Yasuhara, A.2    Sakamoto, T.3
  • 23
    • 0036406094 scopus 로고    scopus 로고
    • Just before submitting this manuscript an article appeared dealing with intramolecular Pd-catalyzed arylation of N-(2-chloroaryl)-N-methylanilines and N-benzyl-N-(2-chloroaryl)-anilines: Bedford, R. B.; Cazin, C. S. J. Chem. Commun. 2002, 2310.
    • (2002) J. Chem. Commun. , pp. 2310
    • Bedford, R.B.1    Cazin, C.S.2
  • 24
    • 0033693716 scopus 로고    scopus 로고
    • Several examples of the beneficial effect of the use of large excesses of inorganic bases in Pd-catalyzed aminations using Pd(BINAP) catalyst have already been reported by our research group: (a) Košmrlj, J.; Maes, B. U. W.; Lemière, G. L. F.; Haemers, A. Synlett 2000, 1581. (b) Jonckers, T. H. M.; Maes, B. U. W.; Lemière, G. L. F.; Dommisse, R. Tetrahedron 2001, 57, 7027. (c) Maes, B. U. W.; Loones, K. T. J.; Jonckers, T. H. M.; Lemière, G. L. F.; Dommisse, R. A.; Haemers, A. Synlett 2002, 1995.
    • (2000) Synlett , pp. 1581
    • Košmrlj, J.1    Maes, B.U.W.2    Lemière, G.L.F.3    Haemers, A.4
  • 25
    • 0035817077 scopus 로고    scopus 로고
    • Several examples of the beneficial effect of the use of large excesses of inorganic bases in Pd-catalyzed aminations using Pd(BINAP) catalyst have already been reported by our research group: (a) Košmrlj, J.; Maes, B. U. W.; Lemière, G. L. F.; Haemers, A. Synlett 2000, 1581. (b) Jonckers, T. H. M.; Maes, B. U. W.; Lemière, G. L. F.; Dommisse, R. Tetrahedron 2001, 57, 7027. (c) Maes, B. U. W.; Loones, K. T. J.; Jonckers, T. H. M.; Lemière, G. L. F.; Dommisse, R. A.; Haemers, A. Synlett 2002, 1995.
    • (2001) Tetrahedron , vol.57 , pp. 7027
    • Jonckers, T.H.M.1    Maes, B.U.W.2    Lemière, G.L.F.3    Dommisse, R.4
  • 26
    • 0036454157 scopus 로고    scopus 로고
    • Several examples of the beneficial effect of the use of large excesses of inorganic bases in Pd-catalyzed aminations using Pd(BINAP) catalyst have already been reported by our research group: (a) Košmrlj, J.; Maes, B. U. W.; Lemière, G. L. F.; Haemers, A. Synlett 2000, 1581. (b) Jonckers, T. H. M.; Maes, B. U. W.; Lemière, G. L. F.; Dommisse, R. Tetrahedron 2001, 57, 7027. (c) Maes, B. U. W.; Loones, K. T. J.; Jonckers, T. H. M.; Lemière, G. L. F.; Dommisse, R. A.; Haemers, A. Synlett 2002, 1995.
    • (2002) Synlett , pp. 1995
    • Maes, B.U.W.1    Loones, K.T.J.2    Jonckers, T.H.M.3    Lemière, G.L.F.4    Dommisse, R.A.5    Haemers, A.6
  • 27
    • 85087593223 scopus 로고    scopus 로고
    • note
    • 3 were performed.
  • 28
    • 0013157111 scopus 로고    scopus 로고
    • For the Pd-catalyzed amination of 2-chloroquinoline with ethyl 2-amino-4-phenyl-1,3-thiazole-5-carboxylate see: Yin, J.; Zhao, M. M.; Huffman, M. A.: McNamara, J. M. Org. Lett. 2002, 4, 3481.
    • (2002) Org. Lett. , vol.4 , pp. 3481
    • Yin, J.1    Zhao, M.M.2    Huffman, M.A.3    McNamara, J.M.4
  • 31
    • 0013116779 scopus 로고    scopus 로고
    • note
    • 2-(Dicyclohexylphosphino)biphenyl, 2-(di-t-butyl-phosphino)biphenyl and tri-t-butylphosphine are commercially available from Strem Chemicals.
  • 32
    • 0013073061 scopus 로고    scopus 로고
    • note
    • Tripotassium phosphate (minimum 98%) was obtained from Sigma (catalogue number: P-5629). The pellets were finely grinded in a mortar.
  • 33
    • 0033534423 scopus 로고    scopus 로고
    • Tri-t-butylphosphine has already been used as an effective ligand in intermolecular Heck reactions of non-activated aryl chlorides with alkenes: (a) Littke, A. F.; Fu, G. C. J. Org. Chem. 1999, 64, 10. (b) Ehrentraut, A.; Zapf, A.; Beller, M. Synlett 2000, 1589. (c) N,N-Dicyclohexyl-methylamine was found to be a superior base for intermolecular Heck reactions of non-activated aryl chloride substrates in comparison with inorganic bases: Littke, A. F.; Fu, G. C. J. Am. Chem. Soc. 2001, 123, 6989. Attempts to use 1.1 equiv of this amine in our intramolecular Pd-catalyzed arylation reaction on 10 gave no better result since starting material remained after 36 h heating.
    • (1999) J. Org. Chem. , vol.64 , pp. 10
    • Littke, A.F.1    Fu, G.C.2
  • 34
    • 0033677599 scopus 로고    scopus 로고
    • Tri-t-butylphosphine has already been used as an effective ligand in intermolecular Heck reactions of non-activated aryl chlorides with alkenes: (a) Littke, A. F.; Fu, G. C. J. Org. Chem. 1999, 64, 10. (b) Ehrentraut, A.; Zapf, A.; Beller, M. Synlett 2000, 1589. (c) N,N-Dicyclohexyl-methylamine was found to be a superior base for intermolecular Heck reactions of non-activated aryl chloride substrates in comparison with inorganic bases: Littke, A. F.; Fu, G. C. J. Am. Chem. Soc. 2001, 123, 6989. Attempts to use 1.1 equiv of this amine in our intramolecular Pd-catalyzed arylation reaction on 10 gave no better result since starting material remained after 36 h heating.
    • (2000) Synlett , pp. 1589
    • Ehrentraut, A.1    Zapf, A.2    Beller, M.3
  • 35
    • 0034838172 scopus 로고    scopus 로고
    • Tri-t-butylphosphine has already been used as an effective ligand in intermolecular Heck reactions of non-activated aryl chlorides with alkenes: (a) Littke, A. F.; Fu, G. C. J. Org. Chem. 1999, 64, 10. (b) Ehrentraut, A.; Zapf, A.; Beller, M. Synlett 2000, 1589. (c) N,N-Dicyclohexyl-methylamine was found to be a superior base for intermolecular Heck reactions of non-activated aryl chloride substrates in comparison with inorganic bases: Littke, A. F.; Fu, G. C. J. Am. Chem. Soc. 2001, 123, 6989. Attempts to use 1.1 equiv of this amine in our intramolecular Pd-catalyzed arylation reaction on 10 gave no better result since starting material remained after 36 h heating.
    • (2001) J. Am. Chem. Soc. , vol.123 , pp. 6989
    • Littke, A.F.1    Fu, G.C.2
  • 36
    • 0013121432 scopus 로고    scopus 로고
    • note
    • Most probably an interphase mechanism is acting since the large excess of base used in the Pd-catalyzed reaction does not dissolve in the solvent used. The insoluble excess speeds up these Pd-catalyzed reactions by supplying a higher surface area.
  • 37
    • 0013117180 scopus 로고    scopus 로고
    • note
    • 4 for the cyclodehydrohalogenation of 10 gave similar results as with 10 equiv while the cyclization of 6 gave a significant rate decrease in comparison with the reference experiment where 10 equiv of base were used.
  • 42
    • 0037193143 scopus 로고    scopus 로고
    • While our work was in progress an article appeared dealing with a photochemical synthesis of isocryptolepine: Kumar, R. N.; Suresh, T.; Mohan, P. S. Tetrahedron Lett. 2002, 43, 3327.
    • (2002) Tetrahedron Lett. , vol.43 , pp. 3327
    • Kumar, R.N.1    Suresh, T.2    Mohan, P.S.3
  • 43
    • 0013117181 scopus 로고    scopus 로고
    • note
    • 3): δ = 103.8, 119.8, 120.5, 121.4, 124.3, 125.7, 125.8, 127.6, 129.5, 130.2, 130.3, 137.2, 145.9, 149.3, 150.8. LRMS (DCI): 255.
  • 44
    • 0013071921 scopus 로고    scopus 로고
    • note
    • 18
  • 45
    • 0013120822 scopus 로고    scopus 로고
    • note
    • 1b


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.