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Volumn , Issue 4, 2011, Pages 489-494

Asymmetric Michael addition of nitrobenzyl pyridines to enals via iminium catalysis

Author keywords

asymmetric catalysis; Michael addition; organocatalysis; pyridine; secondary amine

Indexed keywords

ALDEHYDE DERIVATIVE; AROMATIC NITRO COMPOUND; BENZAZEPINE DERIVATIVE; CARBENE; CHEMICAL COMPOUND; DIARYL COMPOUND; NITROBENZYLPYRIDINE DERIVATIVE; NUCLEOPHILE; PYRIDINE DERIVATIVE; TETRAHYDRO 1 BENZAZEPINE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 79951850684     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0030-1259518     Document Type: Article
Times cited : (32)

References (32)
  • 12
    • 37249064645 scopus 로고    scopus 로고
    • For few selected examples, see: (a)
    • For few selected examples, see: (a) Gotoh, H.; Ishikawa, H.; Hayashi, Y. Org. Lett. 2007, 9, 5307.
    • (2007) Org. Lett. , vol.9 , pp. 5307
    • Gotoh, H.1    Ishikawa, H.2    Hayashi, Y.3
  • 17
    • 79951857870 scopus 로고    scopus 로고
    • a values are referred to DMSO and are taken from the Bordwell Tables, see
    • a values are referred to DMSO and are taken from the Bordwell Tables, see: http://www.chem.wisc.edu/areas/reich/pkatable/index.htm.
  • 18
    • 0003922509 scopus 로고    scopus 로고
    • 'Enolate-like stabilisation of the anion may be achieved for any organic compound with an electron-withdrawing functional group, with at least one π-bond attached to a saturated carbon atom having at least one hydrogen atom': Oxford University Press: Oxford
    • 'Enolate-like stabilisation of the anion may be achieved for any organic compound with an electron-withdrawing functional group, with at least one π-bond attached to a saturated carbon atom having at least one hydrogen atom': Clayden, J.; Greeves, N.; Warren, S.; Wothers, P. Organic Chemistry; Oxford University Press: Oxford, 2001, 529.
    • (2001) Organic Chemistry , pp. 529
    • Clayden, J.1    Greeves, N.2    Warren, S.3    Wothers, P.4
  • 19
    • 0004061172 scopus 로고    scopus 로고
    • Anions on an alkyl side chain that are immediately adjacent to an aromatic ring are subject to varying degrees of stabilisation; this effect is stronger in the 2- or 4-position of a pyridine. Such anions are stabilised in much the same way as an enolate. The word 'enaminate' indicates this type of nitrogen-containing enolate-like anion: 5th Ed.; John Wiley & Sons: Hoboken
    • Anions on an alkyl side chain that are immediately adjacent to an aromatic ring are subject to varying degrees of stabilisation; this effect is stronger in the 2- or 4-position of a pyridine. Such anions are stabilised in much the same way as an enolate. The word 'enaminate' indicates this type of nitrogen-containing enolate-like anion: Joule, J. A.; Mills, K. Heterocyclic Chemistry, 5th Ed.; John Wiley & Sons: Hoboken, 2010, 54-55.
    • (2010) Heterocyclic Chemistry , pp. 54-55
    • Joule, J.A.1    Mills, K.2
  • 22
    • 51749084445 scopus 로고    scopus 로고
    • (c) For a recent review on the efficiency of TMS-diaryl prolinol catalysts, see: Mielgo, A.; Palomo, C. Chem. Asian J. 2008, 3, 922.
    • (2008) Chem. Asian J. , vol.3 , pp. 922
    • Mielgo, A.1    Palomo, C.2
  • 24
    • 79951856552 scopus 로고    scopus 로고
    • note
    • 2O as the solvent system is probably a consequence of the poor solubility of some among the unsaturated aldehydes 2 in this reaction media.
  • 25
    • 79951854718 scopus 로고    scopus 로고
    • note
    • The presence of an alkyl substituent at the b-position of the enal is not tolerated under the reaction condition: i.e., crotonaldehyde remained unreactive.
  • 26
    • 79951853943 scopus 로고    scopus 로고
    • note
    • The observed modest diastereocontrol is not surprising: the privileged secondary amine catalysts, such as B, generally infer high enantioselectivity but with poor diastereocontrol when promoting the conjugate addition of prochiral carbon nucleophiles to α,β-unsaturated aldehydes; see, for example, ref. 6.
  • 27
    • 79951858545 scopus 로고    scopus 로고
    • note
    • 4 reduction is requested since the alcohols 3 allow for a far easier HPLC analysis than the aldehyde precursors.
  • 28
    • 79951850772 scopus 로고    scopus 로고
    • Crystallographic data have been deposited with the accession number CCDC 802673(5), and are available free of charge via
    • Crystallographic data have been deposited with the Cambridge Crystallographic Data Centre, accession number CCDC 802673(5), and are available free of charge via www.ccdc.cam.ac.uk/data-request/cif.
  • 31
    • 79951850289 scopus 로고    scopus 로고
    • note
    • Benzazepines are the core structure of numerous biologically active compounds. More specifically, the tetrahydro-1-benzazepine scaffold can be found in a series of approved drugs such as Tolvaptan, Benazepril, Mozavaptan and Zilpaterol among others.
  • 32
    • 79951857409 scopus 로고    scopus 로고
    • note
    • 2-MeOH, 95:5). See Supporting Information for full experimental details and product characterisation.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.