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Volumn , Issue 1, 2009, Pages 109-111

High-yielding large-scale syntheses of enantiomerically pure NOBIN and a NOBIN-based enantiomerically pure NHC precursor

Author keywords

BINOL; Buchwald Hartwig amination; Imidazolinium chloride; Ligand synthesis; N heterocyclic carbene; NOBIN

Indexed keywords


EID: 62349111053     PISSN: 09365214     EISSN: 14372096     Source Type: Journal    
DOI: 10.1055/s-0028-1087390     Document Type: Article
Times cited : (14)

References (40)
  • 2
    • 85064428639 scopus 로고    scopus 로고
    • First racemic synthesis: (b) Smrčina, M.; Lorenc, M.; Hanuš, V.; Kočovský, P. Synlett 1991, 231.
    • First racemic synthesis: (b) Smrčina, M.; Lorenc, M.; Hanuš, V.; Kočovský, P. Synlett 1991, 231.
  • 4
    • 0010319445 scopus 로고    scopus 로고
    • First resolution: (d) Smrčina, M.; Vyskočil, Š.; Polívková, J.; Poláková, J.; Kočovský, P. Collect. Czech. Chem. Commun. 1996, 61, 1520.
    • First resolution: (d) Smrčina, M.; Vyskočil, Š.; Polívková, J.; Poláková, J.; Kočovský, P. Collect. Czech. Chem. Commun. 1996, 61, 1520.
  • 18
    • 34250693599 scopus 로고    scopus 로고
    • Angew. Chem. 2007, 119, 1115.
    • (2007) Angew. Chem , vol.119 , pp. 1115
  • 21
    • 62349140823 scopus 로고    scopus 로고
    • Angew. Chem. 2007, 119, 4638.
    • (2007) Angew. Chem , vol.119 , pp. 4638
  • 25
    • 53549093543 scopus 로고    scopus 로고
    • Angew. Chem. 2007, 119, 4618.
    • (2007) Angew. Chem , vol.119 , pp. 4618
  • 31
    • 62349134937 scopus 로고    scopus 로고
    • 5 g ca. 50 € [(R)-BINOL, ABCR; (S)-BINOL, AlfaAesar), 1 kg ca
    • Enantiopure BINOL
    • Enantiopure BINOL: 5 g ca. 50 € [(R)-BINOL, ABCR; (S)-BINOL, AlfaAesar), 1 kg ca. 900 $ [(R)- or (S)-BINOL, AK Scientific).
    • 900 $ [(R)- or (S)-BINOL, AK Scientific)
  • 33
    • 62349130543 scopus 로고    scopus 로고
    • S)-BINOL monotriflate (5.59 g, 13.4 mmol) was dissolved in CH2Cl2 (35 mL) and CH2(OMe)2 (35 mL, Then P4O10 (3.93 g, 13.8 mmol, 1.03 equiv) was added within 1 h in 2 portions. The mixture was stirred at r.t. for 7 h, poured into aq NH3 (35, 30 mL, and extracted with CH2Cl2 (3 x 10 mL, The combined organic phases were dried over MgSO4. Evaporation of the solvent under reduced pressure and flash chromatography on SiO2 (eluent: cyclohexane-EtOAc, 95:5) provided the MOM-protected (S)-BINOL monotriflate 518 5.90 g, 95, as a colorless oil. It crystallized slowly when transferred into a refrigerator
    • 18 (5.90 g, 95%) as a colorless oil. It crystallized slowly when transferred into a refrigerator.
  • 34
    • 0037427994 scopus 로고    scopus 로고
    • Acetalization method: Paleo, M. R.; Aurrecoechea, N.; Jung, K.-Y.; Rapoport, H. J. Org. Chem. 2003, 68, 130.
    • Acetalization method: Paleo, M. R.; Aurrecoechea, N.; Jung, K.-Y.; Rapoport, H. J. Org. Chem. 2003, 68, 130.
  • 35
    • 62349120069 scopus 로고    scopus 로고
    • See
    • See: http://www.epa.gov/ttn/atw/hlthef/chlo-eth.html.
  • 36
    • 62349099087 scopus 로고    scopus 로고
    • A suspension of benzylamine 6 (15.9 g, 38.0 mmol) and Pd (10% on C, 2.04 g, 1.99 mmol, 5 mol, in EtOAc (70 mL) was heated under H2 (1 atm) at 60°C for 3 h. After filtration through Celite, the solvent was removed under reduced pressure. The residue was dissolved in CH 2Cl2 (100 mL) and MeOH (100 mL, Concentrated H 2SO4 (6.0 mL) was added and the mixture refluxed for 2 h. Saturated aq NaHCO3 (100 mL) was added after cooling. The mixture was extracted with CH2Cl2 (3 x 50 mL, The combined organic phases were dried over MgSO4. Evaporation of the solvent under reduced pressure provided (S)-NOBIN (1; 9.19 g, 85, as a faintly yellow solid (pure as judged by 1H NMR, Recrystallization from toluene rendered rounded white needles (8.84 g, 82, On a smaller scale (3.29 g of benzylamine 6) the yield of recrystallized 1 was 1.97 g [88, cf. footno
    • 1H NMR). Recrystallization from toluene rendered rounded white needles (8.84 g, 82%). On a smaller scale (3.29 g of benzylamine 6) the yield of recrystallized 1 was 1.97 g [88%; cf. footnote (e) of Scheme 1].
  • 37
    • 62349140529 scopus 로고    scopus 로고
    • Enantiopure NOBIN: 1 g ca. 500 € [(R)- or (S)-NOBIN, ABCR], 10 g ca. 1500 $ [(R)-NOBIN], 50 g ca. 4000 $ [(S)-NOBIN, both Shanghai FWD Chemicals].
    • Enantiopure NOBIN: 1 g ca. 500 € [(R)- or (S)-NOBIN, ABCR], 10 g ca. 1500 $ [(R)-NOBIN], 50 g ca. 4000 $ [(S)-NOBIN, both Shanghai FWD Chemicals].
  • 39
    • 62349119367 scopus 로고    scopus 로고
    • 3N) provided 10 (6.39 g, 89%) as a deep red oil.
    • 3N) provided 10 (6.39 g, 89%) as a deep red oil.
  • 40
    • 62349106332 scopus 로고    scopus 로고
    • The following conditions were adapted from a related transformation: 18 Cs2CO3 (7.51 g, 23.0 mmol, 1.30 equiv) was dried in vacuo with a heat gun for 30 min. After cooling, Pd(OAc)2 (395 mg, 1.76 mmol, 9.90 mol, o-Ph2PC6H 4)2O (1.89 g, 3.51 mmol, 20 mol, and a solution of the MOM-protected monotriflate 5 (8.22 g, 17.8 mmol) and the diamine 10 (4.09 g, 22.9 mmol, 1.29 equiv) in toluene (9 mL) were added. The suspension was degassed and stirred at 115°C for 14 h. Filtration through Celite, evaporation of the solvent under reduced pressure, and flash chromatography on SiO2 (eluent: cyclohexane-EtOAc, 90:10 → 80:20) provided the diamine 12 (7.79 g, 89, as a reddish-brown sticky solid. 1H NMR (400 MHz, CDCl3, TMS, δ, 1.91 (s, 2 x o-CH3, 2.17 (s, p-CH3, 2.95 ddd, 3J
    • 3).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.