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Volumn , Issue 5, 2009, Pages 741-754

Diastereoselective synthesis of γ-amino acids and their derivatives from nitroethane via intermediacy of 5,6-dihydro-4H-1,2-oxazines bearing the CH2CH(CO2Me)2 substituent at C3

Author keywords

amino acids; 2 oxazines, reduction; 5,6 dihydro 4h 1; Oxyiminium cations

Indexed keywords

2-OXAZINES, REDUCTION; 5,6-DIHYDRO-4H-1; DIASTEREOSELECTIVE SYNTHESIS; MALONATES; OXYIMINIUM CATIONS; SODIUM CYANOBOROHYDRIDE; STEREO-SELECTIVE; TWO-STEP REDUCTIONS;

EID: 63449132892     PISSN: 00397881     EISSN: 1437210X     Source Type: Journal    
DOI: 10.1055/s-0028-1083360     Document Type: Article
Times cited : (18)

References (45)
  • 8
    • 63449109976 scopus 로고    scopus 로고
    • Chrystal, E. J. T.; Gilchrist, T. L.; Stretch, W. J. Chem. Res., Synop. 1987, 180; J. Chem. Res., Miniprint 1987, 1563.
    • Chrystal, E. J. T.; Gilchrist, T. L.; Stretch, W. J. Chem. Res., Synop. 1987, 180; J. Chem. Res., Miniprint 1987, 1563.
  • 22
    • 63449121282 scopus 로고    scopus 로고
    • Our attempts to reduce the N-O bond [H2 (75 bar, Raney nickel, 100 °C; H2 (60 bar, 5% Pd/C, 100 °C; SmI2 THF; COCl2, NaBH4, MeOH] in products 10 failed, therefore they could not be used in route c Scheme 3
    • 4, MeOH] in products 10 failed, therefore they could not be used in route c (Scheme 3).
  • 23
    • 63449109011 scopus 로고    scopus 로고
    • 2O nor with CbzCl.
    • 2O nor with CbzCl.
  • 24
    • 63449121883 scopus 로고    scopus 로고
    • 3CN, AcOH, Scheme 9).
    • 3CN, AcOH, Scheme 9).
  • 25
    • 63449139215 scopus 로고    scopus 로고
    • Successful transformation 6h to 10h can be realized only by heating 6h in AcOH (see experimental part).
    • Successful transformation 6h to 10h can be realized only by heating 6h in AcOH (see experimental part).
  • 26
    • 63449137956 scopus 로고    scopus 로고
    • For similar processes in the hydrogenation of other 6- phenyl-substituted 5,6-dihydro-4H-1,2-oxazines see ref. 3.
    • For similar processes in the hydrogenation of other 6- phenyl-substituted 5,6-dihydro-4H-1,2-oxazines see ref. 3.
  • 32
    • 63449083687 scopus 로고    scopus 로고
    • Reduction of iminium salt 15c to tetrahydrooxazine 6c is accompanied by the partial formation of oxime ether 4c yield: 25
    • Reduction of iminium salt 15c to tetrahydrooxazine 6c is accompanied by the partial formation of oxime ether 4c (yield: 25%).
  • 35
    • 63449120744 scopus 로고    scopus 로고
    • Lambert, J. B.; Takeuchi, Y. Cyclic Organonitrogen Stereodynamics; VCH: New York, 1992, Chap 7.1.1 and 7.2.1, and references cited therein.
    • Lambert, J. B.; Takeuchi, Y. Cyclic Organonitrogen Stereodynamics; VCH: New York, 1992, Chap 7.1.1 and 7.2.1, and references cited therein.
  • 39
    • 63449134224 scopus 로고    scopus 로고
    • It is noteworthy, that according to NMR cation 15c and its precursor, dihydrooxazine 4c, have the same dominant conformation.
    • It is noteworthy, that according to NMR cation 15c and its precursor, dihydrooxazine 4c, have the same dominant conformation.
  • 40
    • 63449102154 scopus 로고    scopus 로고
    • In the studies23 the stereochemistry of C-C coupling with six-membered cyclic nitronates possessing substitution at C5 was not examined. The stereochemical course the reduction of some 5-substituted dihydrooxazines with NaBH3CN10 can be also rationalized in terms of proximal approach of the reducing agent to the cation intermediate
    • 10 can be also rationalized in terms of proximal approach of the reducing agent to the cation intermediate.
  • 41
    • 63449127242 scopus 로고    scopus 로고
    • An example of such a process is discussed in ref. 23a
    • An example of such a process is discussed in ref. 23a.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.