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Volumn 75, Issue 5, 2010, Pages 1723-1732

Scope and limitations of an efficient four-component reaction for dihydropyridin-2-ones

Author keywords

[No Author keywords available]

Indexed keywords

CHEMICAL EQUATIONS; CIS ISOMERS; COMPUTATIONAL STUDIES; CYCLOCONDENSATION; DIASTEREO-SELECTIVITY; DIASTEREOMERIC RATIOS; DIASTEREOMERS; ELEVATED TEMPERATURE; FUNCTIONALIZED; HIGH YIELD; IN-SITU; ISONITRILES; PHOSPHONATES;

EID: 77949304343     PISSN: 00223263     EISSN: 15206904     Source Type: Journal    
DOI: 10.1021/jo902613j     Document Type: Article
Times cited : (24)

References (76)
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    • (2005) Angew. Chem., Int. Ed , vol.44 , pp. 1602-1634
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    • and references therein
    • Breit, B. Angew. Chem., Int. Ed. 2005, 44, 6816-6825. and references therein.
    • (2005) Angew. Chem., Int. Ed , vol.44 , pp. 6816-6825
    • Breit, B.1
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    • a) Schreiber, S. L. Science 2000, 287, 1964-1969.
    • (2000) Science , vol.287 , pp. 1964-1969
    • Schreiber, S.L.1
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    • Glasnov, T. N.; Vugts, D. J.; Koningstein, M. M.; Desai, B.; Fabian, W. M. F.; Orru, R. V. A.; Kappe, C. O. OSAR Comb. Sci. 2006, 25, 509.
    • c) Glasnov, T. N.; Vugts, D. J.; Koningstein, M. M.; Desai, B.; Fabian, W. M. F.; Orru, R. V. A.; Kappe, C. O. OSAR Comb. Sci. 2006, 25, 509.
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    • Bedjequelal, K.; Bienaymé, H.; Poigny, S.; Schmitt, Ph.; Tam, E. OSAR Comb. Sci. 2006, 25, 504-508.
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    • Stille, J. R.; Barta, N. S. In Studies in Natural Products Chemistry; Ata-ur-Rahman, Ed.; Elsevier Science: Amsterdam, 1996; 18, pp 315-389.
    • Stille, J. R.; Barta, N. S. In Studies in Natural Products Chemistry; Ata-ur-Rahman, Ed.; Elsevier Science: Amsterdam, 1996; Vol. 18, pp 315-389.
  • 62
    • 77949285820 scopus 로고    scopus 로고
    • Only in the case of DHP-2-one 12r it was possible to get some pure fractions of both diastereomers.
    • Only in the case of DHP-2-one 12r it was possible to get some pure fractions of both diastereomers.
  • 63
    • 77949300547 scopus 로고    scopus 로고
    • No clear side products could be isolated, although multiple spots on thin-layer chromatography were visible
    • No clear side products could be isolated, although multiple spots on thin-layer chromatography were visible.
  • 66
    • 77949281799 scopus 로고    scopus 로고
    • The high diastereoselectivity of reactions involving α-aryl isocyanoacetates may also be the result of π-interaction in the transition state, apparently favoring in the cis-diastereomer
    • The high diastereoselectivity of reactions involving α-aryl isocyanoacetates may also be the result of π-interaction in the transition state, apparently favoring in the cis-diastereomer.
  • 68
    • 77949292086 scopus 로고    scopus 로고
    • The other diastereomer showed only a weak correlation (or none at all), which is expected for the ircro-diastereonier (Figure 1b).
    • The other diastereomer showed only a weak correlation (or none at all), which is expected for the ircro-diastereonier (Figure 1b).
  • 69
    • 77949279931 scopus 로고    scopus 로고
    • 4 substituents, probably because in the former case these protons are deshielded by the aromatic R substituent.
    • 4 substituents, probably because in the former case these protons are deshielded by the aromatic R substituent.
  • 70
    • 77949291877 scopus 로고    scopus 로고
    • 4 substituents the coupling constant between protons H4 and H5 is generally between 4.0 and 6.0 Hz.
    • 4 substituents the coupling constant between protons H4 and H5 is generally between 4.0 and 6.0 Hz.
  • 71
    • 77949280778 scopus 로고    scopus 로고
    • The cis-diastereomer was selectively crystallized from a solution containing a 83:17 (cis:trans) mixture of diastereomers;
    • a) The cis-diastereomer was selectively crystallized from a solution containing a 83:17 (cis:trans) mixture of diastereomers;
  • 73
    • 77949282770 scopus 로고    scopus 로고
    • This assumption is made based on the standard Karplus Curve; see: Basic One- and Two-Dimensional NMR Spectroscopy, 3rd revised ed, Friebolin, H, Ed, Wiley-VCH: Weinheim, 1998
    • This assumption is made based on the standard Karplus Curve; see: Basic One- and Two-Dimensional NMR Spectroscopy, 3rd revised ed.; Friebolin, H., Ed.; Wiley-VCH: Weinheim, 1998.
  • 74
    • 77949299594 scopus 로고    scopus 로고
    • Although the stereochemistry of DHP-2-one 35b was not determined using NOE experiments, it is expected to have the same cis-diastereoselectivity as the DHP-2-ones prepared with α-aryl isocyanoacetates. The coupling constant between H4 and H5 is 4.4 Hz, which is similar to its isonitrile variant (4.5 Hz, In addition, the chemical shift value of the H4 proton is identical 4.34 vs 4.32 ppm
    • Although the stereochemistry of DHP-2-one 35b was not determined using NOE experiments, it is expected to have the same cis-diastereoselectivity as the DHP-2-ones prepared with α-aryl isocyanoacetates. The coupling constant between H4 and H5 is 4.4 Hz, which is similar to its isonitrile variant (4.5 Hz). In addition, the chemical shift value of the H4 proton is identical (4.34 vs 4.32 ppm).
  • 75
    • 77949280116 scopus 로고    scopus 로고
    • A table with these values is presented in the Supporting Information. In addition to the mentioned α-acidic esters, the same parameters are calculated for 11c and 34a.
    • A table with these values is presented in the Supporting Information. In addition to the mentioned α-acidic esters, the same parameters are calculated for 11c and 34a.
  • 76
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    • 13C NMR are denoted where possible.
    • 13C NMR are denoted where possible.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.