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Volumn 63, Issue 2, 2007, Pages 337-346

Microwave-assisted solvent-free intramolecular 1,3-dipolar cycloaddition reactions leading to hexahydrochromeno[4,3-b]pyrroles: scope and limitations

Author keywords

1,3 Dipolar cycloaddition; Azomethine ylides; Intramolecular cycloaddition; Microwave assisted synthesis; Solvent free synthesis

Indexed keywords

ALKENE DERIVATIVE; PYRROLE DERIVATIVE;

EID: 33751541673     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tet.2006.10.074     Document Type: Article
Times cited : (49)

References (57)
  • 6
    • 0000629986 scopus 로고
    • Trost B.M., and Flemming I. (Eds), Pergamon, Oxford
    • Wade P. In: Trost B.M., and Flemming I. (Eds). Comprehensive Organic Synthesis Vol. 4 (1991), Pergamon, Oxford 1111-1168
    • (1991) Comprehensive Organic Synthesis , vol.4 , pp. 1111-1168
    • Wade, P.1
  • 16
    • 33751551747 scopus 로고    scopus 로고
    • See Ref. 6c;
  • 20
    • 33751513112 scopus 로고    scopus 로고
    • (a) See Ref. 6g;
  • 22
    • 4544308024 scopus 로고    scopus 로고
    • Other microwave-assisted solvent-free reactions of azomethine ylides:
    • Pospíšil J., and Potáček M. Eur. J. Org. Chem. (2004) 710-716 Other microwave-assisted solvent-free reactions of azomethine ylides:
    • (2004) Eur. J. Org. Chem. , pp. 710-716
    • Pospíšil, J.1    Potáček, M.2
  • 32
    • 33751546424 scopus 로고    scopus 로고
    • note
    • This very polar fraction, which sticks on the silica gel, presented a very complicated mixture of probably decomposed reaction intermediates, which was not possible to analyze. At first, we have expected the formation of product of the Claisen rearrangement, however, this product was not observed in the reaction mixture.
  • 38
    • 33751532768 scopus 로고    scopus 로고
    • note
    • The condensation of the water was observed above the open reaction vessel in the course of the reaction.
  • 39
    • 2442431500 scopus 로고    scopus 로고
    • This reaction is possible to extend to other aldehydes as well as N-alkyl 2-alkylaminoacetamides and represents an elegant way for the preparation of 1,2,3-trialkyl substituted imidazolin-4-ones. Desired compounds are formed generally in 5 min (200 °C, μW) in 90-96% yields. Interestingly, the reaction is possible to carry out under the classical heating with comparable yields, however, the reaction times are longer (30 min). See:
    • This reaction is possible to extend to other aldehydes as well as N-alkyl 2-alkylaminoacetamides and represents an elegant way for the preparation of 1,2,3-trialkyl substituted imidazolin-4-ones. Desired compounds are formed generally in 5 min (200 °C, μW) in 90-96% yields. Interestingly, the reaction is possible to carry out under the classical heating with comparable yields, however, the reaction times are longer (30 min). See:. Pospíšil J., and Potáček M. Heterocycles 63 (2004) 1165-1173
    • (2004) Heterocycles , vol.63 , pp. 1165-1173
    • Pospíšil, J.1    Potáček, M.2
  • 40
    • 33751502866 scopus 로고    scopus 로고
    • note
    • Interestingly, no products of the intermolecular reaction (dimers, trimers,...) were observed in the reaction mixture (GC-MS).
  • 41
    • 33751506202 scopus 로고    scopus 로고
    • note
    • a of the equivalent hydrogen atom attached to the carbon next to ester group is ∼28. The values are valid in DMSO (see Ref. 11).
  • 43
    • 33751551967 scopus 로고    scopus 로고
    • note
    • Stabilities of aldehyde 4, amines 18a-c and cycloadducts 20a-c under the reaction conditions were tested and all the compounds were reisolated in >85% yield. Typical temperature profile of the reaction is presented in Graph S-1 and can be found in Supplementary data.
  • 49
    • 33751505313 scopus 로고    scopus 로고
    • note
    • 1H NMR. See Supplementary data Graph S-2.
  • 50
  • 57
    • 33751505123 scopus 로고    scopus 로고
    • Kende, A. S.; Fludzinski, P. Organic Syntheses; Wiley: New York, NY, 1990; Collect. Vol. 7, p 221.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.