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Volumn 80, Issue 2, 2015, Pages 965-979

Strategies to control alkoxy radical-initiated relay cyclizations for the synthesis of oxygenated tetrahydrofuran motifs

Author keywords

[No Author keywords available]

Indexed keywords

ATOMS; FREE RADICAL REACTIONS; OXYGEN;

EID: 84921303914     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo502499a     Document Type: Article
Times cited : (39)

References (92)
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    • (1991) Comprehensive Organic Synthesis , vol.4 , pp. 779-831
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    • (i) Wang, K. K. Chem. Rev. 1996, 96, 207-222.
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    • Wang, K.K.1
  • 56
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    • Renaud, P., Sibi, M. P., Eds.; Wiley-VCH: Toronto, Chapter 5.2
    • (a) Hartung, J. In Radicals in Organic Synthesis; Renaud, P., Sibi, M. P., Eds.; Wiley-VCH: Toronto, 2001; Vol. 2, Chapter 5.2, pp 427-439.
    • (2001) Radicals in Organic Synthesis , vol.2 , pp. 427-439
    • Hartung, J.1
  • 65
    • 84921288504 scopus 로고    scopus 로고
    • note
    • Procedures for the preparation of 19b and 19h can be found in ref 8.
  • 69
    • 84921269194 scopus 로고    scopus 로고
    • note
    • The corresponding boatlike transition states have not been depicted as they are significantly higher in energy than the two chairlike transition states depicted in Figure 5.
  • 73
    • 84921260546 scopus 로고    scopus 로고
    • note
    • The linear-quenched product accounts for some of the remaining mass balance. This is commonly observed in these relay cyclizations (ref 8). However, no THP ring formation was observed by 1H NMR spectroscopy.
  • 74
    • 84921296703 scopus 로고    scopus 로고
    • note
    • Previous EI mass spec studies involving alkoxy radical 1,6-HAT in steroidal derivatives did not indicate that any product resulted from a 1,5-HAT (see ref 32). A subsequent study by Suárez and co-workers indicated that the observed 1,6-HAT did not proceed stepwise through a 1,5-HAT functionalized intermediate (see ref 33).
  • 75
    • 0004035157 scopus 로고
    • Abramovitch, R. A., Ed.; Plenum: New York
    • (a) Burn, P.; Waegell, B. Reactive Intermediates; Abramovitch, R. A., Ed.; Plenum: New York, 1983; Vol. 3, pp 367-426.
    • (1983) Reactive Intermediates , vol.3 , pp. 367-426
    • Burn, P.1    Waegell, B.2
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    • 0000213430 scopus 로고    scopus 로고
    • Renaud, P., Sibi, M. P., Eds.; Wiley-VCH: Weinheim
    • (b) Suárez, E.; Rodriguez, M. S. Radicals in Organic Synthesis; Renaud, P., Sibi, M. P., Eds.; Wiley-VCH: Weinheim, 2001; Vol. 2, pp 440-454.
    • (2001) Radicals in Organic Synthesis , vol.2 , pp. 440-454
    • Suárez, E.1    Rodriguez, M.S.2
  • 77
    • 84921267195 scopus 로고    scopus 로고
    • note
    • To simplify analysis, competition substrate 61 was utilized instead of a substitution pattern analogous to that presented in Figure 7 (53). See the Supporting Information for details.
  • 79
    • 84921279728 scopus 로고    scopus 로고
    • note
    • The relative configuration of the stereoisomers was not determined.
  • 80
    • 84921291947 scopus 로고    scopus 로고
    • note
    • Further reductions in temperature were attempted using triethylborane and oxygen. However, these conditions were not effective initiating the relay cyclization.
  • 81
    • 84921300734 scopus 로고    scopus 로고
    • note
    • It is likely that the minor diastereomer was removed during purification.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.