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Volumn 55, Issue 4, 1999, Pages 909-918

Crystallization-induced asymmetric transformation: Stereospecific synthesis of L-768,673

Author keywords

Asymmetric synthesis; Benzodiazepines; Oximes; Resolution racemization

Indexed keywords

ANTIARRHYTHMIC AGENT; BENZENE DERIVATIVE; BENZODIAZEPINE DERIVATIVE; L 768 673; OXIME; PHENYLACETIC ACID; UNCLASSIFIED DRUG;

EID: 0033593248     PISSN: 00404020     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4020(98)01098-9     Document Type: Article
Times cited : (23)

References (32)
  • 6
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    • 2,3-dihydro-5-phenyl-1-(2,2,2-trifluoroethyl)-1H-benzo[e][1,4]diazepine (4) was purchased from Fabbrica Italiana Sintetici; for the synthesis, see (a) Steinman, M.; Topliss, J. G.; Alekel, R.; Wong, Y.-S.; York, E. E. J. Med. Chem. 1973, 16, 1354-1360;
    • (1973) J. Med. Chem. , vol.16 , pp. 1354-1360
    • Steinman, M.1    Topliss, J.G.2    Alekel, R.3    Wong, Y.-S.4    York, E.E.5
  • 8
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    • see ref. 1
    • (c) see ref. 1.
  • 10
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    • (b) We speculated that lower yields (∼55%) of oxime 5 were resulted from the isoamyl alkoxide induced Beckmann fragmentation of α-keto ketoxime. For reviews, see Gawley, R. E. Org. React. 1988, 35, 1-420.
    • (1988) Org. React. , vol.35 , pp. 1-420
    • Gawley, R.E.1
  • 13
    • 0013513572 scopus 로고    scopus 로고
    • note
    • 4) = 65:35; Flow Rate = 0.5 ml/min; UV = 220 nm; Rt (min): for 7 (as its hydrocinnamoyl amide made from the modified Schotten-Baumman procedure): 14.9 (R-isomer), 18.1 (S-isomer); For 1: 16.1 (R-isomer), 19.7 (S-isomer).
  • 14
    • 0013548867 scopus 로고    scopus 로고
    • note
    • Addition of water (1.5 - 2.0 mol) is critical for success in the resolution-racemization process. The isolated mandelate salt 7 was shown to be a hydrate and without the addition of water the process is much slower and the yield is lower.
  • 18
    • 0013513747 scopus 로고
    • US Patent, US 5,162,577
    • For regioselective ortho-lithiation of 1,3-bis(trifluoromethyl)benzene under various conditions see: (a) Masciadri, R. US Patent, US 5,162,577, 1992;
    • (1992)
    • Masciadri, R.1
  • 19
    • 0013512269 scopus 로고
    • European Patent, EP 0 491 326 A2
    • (b) Castaldi, G.; Borsotti, G. European Patent, EP 0 491 326 A2, 1992;
    • (1992)
    • Castaldi, G.1    Borsotti, G.2
  • 21
    • 0013526201 scopus 로고    scopus 로고
    • note
    • 2D quench leads us to speculate that there is an equilibrium between aryl lithium 9 and TMP when a stoichiometric amount of base (Li-TMP) is used. In the catalytic reaction conditions, the proton transport vehicle (TMP) for the equilibrium is eliminated by addition of excess n-BuLi to insure the complete conversion. We believed that highly selective ortho-lithiation of 1,3-bis(trifluoromethyl)benzene (8) in both stoichiometric and catalytic conditions are attributed to the formation of Li-TMP. Use of n-BuLi in the absence of TMP afforded only 3:1 selectivity.
  • 22
    • 0013513870 scopus 로고    scopus 로고
    • note
    • 2), a ratio of 24/3/1 mixture of the corresponding regioisomeric carboxylic acids was observed.
  • 27
    • 80054972295 scopus 로고
    • Springer-Verlag: Berlin Heidelberg New York, 2nd, Revised Edition
    • Bodanszky, M.; Bodanszky, A. The Practice of Peptide Synthesis, Springer-Verlag: Berlin Heidelberg New York, 1994, 2nd, Revised Edition, pp 75-126.
    • (1994) The Practice of Peptide Synthesis , pp. 75-126
    • Bodanszky, M.1    Bodanszky, A.2
  • 28
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    • Zabicky Wiley: New York
    • For reviews, see Beckwith in Zabicky The Chemistry of Amides, Wiley: New York, 1970, pp 73-185.
    • (1970) The Chemistry of Amides , pp. 73-185
    • Beckwith1
  • 32
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    • note
    • Performance-based exposure control limit(s) (PB-ECL) - An assigned health hazard category by Merck, within five category classification system of increasing hazard potential, which also defines the level of containment required to control exposure to an acceptable level based upon the inherent pharmacological and toxicological properties of the compound. A level-4 compound, such as 1, is restricted to glove box handling due to its potency.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.