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Volumn , Issue 6, 2009, Pages 925-928

Mild Michael addition of glycine imines to aromatic nitroalkenes catalyzed by DBU with LiOTf as an additive

Author keywords

Amino acids; Catalysis; DBU; Michael addition; Nitroalkene

Indexed keywords

ALKENE DERIVATIVE; AMINO ACID; AROMATIC COMPOUND; GLYCINE DERIVATIVE; GLYCINE IMINE; NITROALKENE; UNCLASSIFIED DRUG;

EID: 63849333390     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0028-1088210     Document Type: Article
Times cited : (12)

References (48)
  • 3
    • 36849051865 scopus 로고    scopus 로고
    • For recent reviews, see: a
    • For recent reviews, see: (a) Najera, C.; Sansano, J. M. Chem. Rev. 2007, 107, 4584.
    • (2007) Chem. Rev , vol.107 , pp. 4584
    • Najera, C.1    Sansano, J.M.2
  • 33
    • 33746290157 scopus 로고    scopus 로고
    • The benzaldehyde derived glycine imines have been widely used as precursor of 1,3-dipole in [3+2] reactions. For recent examples, see: (a) Yan, X.-X.; Peng, Q.; Zhang, Y.; Zhang, K.; Hong, W.; Hou, X.-L.; Wu, Y.-D. Angew. Chem. Int. Ed. 2006, 45, 1979.
    • The benzaldehyde derived glycine imines have been widely used as precursor of 1,3-dipole in [3+2] reactions. For recent examples, see: (a) Yan, X.-X.; Peng, Q.; Zhang, Y.; Zhang, K.; Hong, W.; Hou, X.-L.; Wu, Y.-D. Angew. Chem. Int. Ed. 2006, 45, 1979.
  • 48
    • 63849183571 scopus 로고    scopus 로고
    • General Procedure for Michael Addition of Glycine Imines to Aromatic Nitroalkenes To a stirred solution of nitroalkene (1.2 mmol, LiOTf (16 mg, 0.1 mmol, and ethyl diphenylmethyleneiminoacetate (267 mg, 1 mmol) or tert-butyl diphenylmethyleneiminoacetate (295 mg, 1 mmol) in dry THF (1 mL) was added DBU (15 mg, 0.1 mmol) in dry THF (1 mL, The mixture was stirred at r.t. for 24 h. After being quenched by H2O, the mixture was extracted by CH2Cl2. The organic phase was separated and dried with Na2SO4. The diastereoselectivity was determined by NMR analysis of curde product. The sample for analysis was purified on column chromatography (SiO2, 200-300 mesh) using PE-EtOAc (20:1) as eluent and recrystallized from Et2O and PE. syn-Ethyl 2-Diphenylmethyleneimino-4-nitro-3-phenylbutanoate (5a) According to the general procedure, a white solid was obtained; mp 84-85 °C. 1H NMR 300
    • 4: C, 72.54; H, 6.09; N, 6.51. Found: C, 72.36; H, 6.22; N, 6.35.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.