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Volumn 37, Issue 1, 1997, Pages 69-80

Tremorgenic indole alkaloids. 10. An improved asymmetric synthesis of a tricyclic common intermediate

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EID: 0031527409     PISSN: 00212148     EISSN: None     Source Type: Journal    
DOI: 10.1002/ijch.199700009     Document Type: Article
Times cited : (12)

References (80)
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    • σ-Bond construction of trisubstituted olefins is a unifying theme in our recent syntheses of FK506, rapamycin, and discodermolide; for leading references see: Smith, A.B., III; Chen, K; Robinson, D.J.; Laasko, L.M.; Hale, K.L. Tetrahedron Lett. 1994, 35, 4271; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 947; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy, J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 962-973. Smith, A.B., III; Qiu, Y.; Jones, D.R.; Kobayashi, K. J. Am. Chem. Soc. 1995, 117, 12011.
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    • σ-Bond construction of trisubstituted olefins is a unifying theme in our recent syntheses of FK506, rapamycin, and discodermolide; for leading references see: Smith, A.B., III; Chen, K; Robinson, D.J.; Laasko, L.M.; Hale, K.L. Tetrahedron Lett. 1994, 35, 4271; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 947; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy, J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 962-973. Smith, A.B., III; Qiu, Y.; Jones, D.R.; Kobayashi, K. J. Am. Chem. Soc. 1995, 117, 12011.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 947
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    • σ-Bond construction of trisubstituted olefins is a unifying theme in our recent syntheses of FK506, rapamycin, and discodermolide; for leading references see: Smith, A.B., III; Chen, K; Robinson, D.J.; Laasko, L.M.; Hale, K.L. Tetrahedron Lett. 1994, 35, 4271; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 947; Smith, A.B., III; Condon, S.M.; McCauley, J.A.; Leazer, J.L., Jr.; Leahy, J.W.; Maleczka, R.E. J. Am. Chem. Soc. 1997, 119, 962-973. Smith, A.B., III; Qiu, Y.; Jones, D.R.; Kobayashi, K. J. Am. Chem. Soc. 1995, 117, 12011.
    • (1997) J. Am. Chem. Soc. , vol.119 , pp. 962-973
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    • (1995) J. Am. Chem. Soc. , vol.117 , pp. 12011
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    • and references cited therein
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    • (1995) Synlett , pp. 1197
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    • note
    • 4.
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    • note
    • Materials and Methods. All reactions were carried out in flame-or oven-dried glassware under an argon atmosphere with dry, freshly distilled solvents, unless otherwise indicated. Tetrahydrofuran and diethyl ether were distilled under argon from sodium/benzophenone. Dichloromethane was distilled from calcium hydride. Triethylamine, diisopropylamine, N,N-diisopropylethylamine, DBU, and DMPU were dried and distilled from calcium hydride and stored over KOH. Anhydrous t-butanol and nitromethane were dried and distilled from calcium hydride and stored over 4-Å molecular sieves. Methyllithium was purchased from Aldrich and standardized by titration with diphenylacetic acid. All reactions were monitored by TLC using E. Merck 0.25-mm precoated silica gel plates. Flash chromatography was performed with the indicated solvents and silica gel-60 (particle size 0.040-0.062 mm) supplied by E. Merck. Yields refer to chromatographically and spectroscopically pure compounds unless otherwise stated. The instrumentation described in ref 1 was again em3 ployed in this work.
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    • Preparation of zinc-copper couple: LeGoff, E. J. Org. Chem. 1964, 29, 2048. Following the acetic acid wash described by LeGoff, the zinc-copper couple was washed with water (5×), ethanol (4×), and then ether (5×).
    • (1964) J. Org. Chem. , vol.29 , pp. 2048
    • LeGoff, E.1
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    • note
    • The buffer solution was prepared by addition of 3 M aqueous formic acid (25.8 mL) to 3 M KOH (9.6 mL) and dilution to 100 mL.


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