Easy synthesis of new 2-oxo-2,3-dihydro-1H-pyrrolo[1,2-b]pyrazole systems

Synlett

Volumn , Issue 7, 2000, Pages 955-958

  Attanasi, Orazio A ^a   De Crescentini, Lucia ^a   Filippone, Paolino ^a   Mantellini, Fabio ^a  

^a UNIVERSITY OF URBINO   (Italy)

Author keywords

1,2 diaza 1,3 butadienes; Cyclization; Michael additions; Pyrroles; Pyrrolo 1,2 b pyrazoles

Indexed keywords

PYRAZOLE DERIVATIVE; PYRROLE DERIVATIVE;

ARTICLE; CHEMICAL ANALYSIS; CHEMICAL REACTION; CHEMICAL STRUCTURE; DEHYDRATION; SYNTHESIS;

EID: 0033944316     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: None     Document Type: Article

References (59)

1. Beilstein on line
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41. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
42. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
43. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
44. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
45. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
46. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
47. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
48. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
49. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
50. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
51. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
52. Gilchrist, T. L., Sanchez Romero, O. A.; Wasson, R. C. J. Chem. Soc., Perkin Trans. 1 1989, 353. Vors, J. J. Heterocycl. Chem. 1990, 27, 579. Ferguson, G.; Lough, A. J.; Mackay, D.; Weeratunga, G. J. Chem. Soc., Perkin Trans. 1 1991, 3361. Avalos, M; Babiano, R.; Cintas P.; Jiménez, J. L.; Molina, M. M.; Palacios, J. C.; Sánchez, J. B. Tetrahedron Lett. 1991, 32, 2513. Clarke, S. J.; Gilchrist, T. L.; Lemos, A.; Roberts, T. G. Tetrahedron 1991, 47, 5615. Banert, K.; Hagedorn, M. Tetrahedron Lett. 1992, 33, 7331. Gilchrist.T. L.; Lemos, A. J. Chem. Soc. Perkin Trans. 1 1993, 1391. Schantl, J. G.; Kählig, H.; Prean, M. Heterocycles 1994, 37, 1873. Baxter, A. J. G.; Fuher, J.; Teague, S. J. Synthesis 1994, 207. Baccolini, G.; Orsolan, G.; Mezzina, E. Tetrahedron Lett. 1995, 36, 447. Avalos, M.; Babiano, R.; Cintas, P.; Jiménez, J. L.; Palacios, J. C.; Sánchez, J. B. Tetrahedron: Asymmetry 1995, 6, 945. South, M. S.; Jakuboski, T. L. Tetrahedron Lett. 1995, 36, 5703. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. Tetrahedron Lett. 1996, 37, 1351. South, M. S.; Jakuboski, T. L.; Westmeyer, M. D.; Dukesherer, D. R. J. Org. Chem. 1996, 61, 8921. Bozzini, S.; Felluga, F.; Nardin, G.; Pizzioli, A.; Pitacco,G.; Valentin, E.J. Chem. Soc., Perkin Trans. I 1996, 1961. Baccolini, G.; Todesco, P. E.; Dalpozzo, R.; De Nino, A. Gazz. Chim. Ital. 1996, 126, 271. Caposcialli, N.; Dell'Erba, C.; Novi, M.; Petrillo, G.; Tavani, C. Tetrahedron 1998, 54, 5315; and the references cited therein.
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55. K. Banert, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 1; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; S. Polanc, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 2; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; and references cited therein.
56. K. Banert, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 1; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; S. Polanc, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 2; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; and references cited therein.
57. K. Banert, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 1; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; S. Polanc, in Targets in Heterocyclic Systems - Chemistry and Properties, Vol. 3, Chapt. 2; O. A. Attanasi and D. Spinelli, Eds., Società Chimica Italiana, Rome, 2000; and references cited therein.
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