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Volumn 127, Issue 30, 2005, Pages 10500-10501

1,2-Halogen migration in haloallenyl ketones: Regiodivergent synthesis of halofurans

Author keywords

[No Author keywords available]

Indexed keywords

ALLENE DERIVATIVE; FURAN DERIVATIVE; HALOGEN; KETONE DERIVATIVE;

EID: 23044485049     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja053290y     Document Type: Article
Times cited : (340)

References (41)
  • 1
    • 33947088987 scopus 로고
    • For scattered reports on nonselective halogen migration in unsaturated systems, see. for example: (a) Bunnett, J. F. Acc. Chem. Res. 1972, 5, 139.
    • (1972) Acc. Chem. Res. , vol.5 , pp. 139
    • Bunnett, J.F.1
  • 19
    • 33444457329 scopus 로고    scopus 로고
    • note
    • Bromoallene 1a contained trace to notable amounts of bromopropargyl ketone 4a, from which it was obtained. Under reaction conditions, 4 underwent rapid isomerization to 1. The same applies to iodoallene 1i (see Table 2). Facile propargyl-allenyl isomerization of propargyl ketones in the presence of gold catalyst was previously observed by Hashmi; see ref 12c.
  • 20
    • 33444471656 scopus 로고    scopus 로고
    • note
    • See Supporting Information for details.
  • 38
    • 0035819945 scopus 로고    scopus 로고
    • This is in striking contrast to cycloisomerization of alkynyl imines, where significant loss of deuterium was observed. See: Kel'in, A. V.; Sromek, A. W.; Gevorgyan, V. J. Am. Chem. Soc. 2001, 123, 2074.
    • (2001) J. Am. Chem. Soc. , vol.123 , pp. 2074
    • Kel'in, A.V.1    Sromek, A.W.2    Gevorgyan, V.3
  • 39
    • 0000706688 scopus 로고    scopus 로고
    • Decrease in regioselectivity of deuterium versus bromine migration is explained by the isotope effect analogous to that observed by Hashmi in the Pd-catalyzed cycloisomerization of allenyl ketones. See: Hashmi, A. S. K.; Ruppert, T. L.; Knöfel, T.; Bats, J. W. J. Org. Chem. 1997, 62, 7295.
    • (1997) J. Org. Chem. , vol.62 , pp. 7295
    • Hashmi, A.S.K.1    Ruppert, T.L.2    Knöfel, T.3    Bats, J.W.4
  • 40
    • 33444471912 scopus 로고    scopus 로고
    • note
    • 3-catalyzed propargyl-allenyl isomerization (see ref 9) is responsible for partial incorporation of deuterium in position 3 of rf-2k (4 for rf-3k).
  • 41
    • 33444474202 scopus 로고    scopus 로고
    • note
    • Much more sluggish reaction of 1j is in accordance with decreased ability of the Cl atom to form halirenium species b (Scheme 1).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.