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Volumn 38, Issue 15, 1997, Pages 2717-2720

Enantioselective synthesis of α-hydroxy phosphonates using the LaLi3tris(binaphthoxide) catalyst (LLB), prepared by an improved method

Author keywords

[No Author keywords available]

Indexed keywords

ALPHA HYDROXYPHOSPHONIC ACID DERIVATIVE; PHOSPHONIC ACID DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0030907801     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0040-4039(97)00437-1     Document Type: Article
Times cited : (119)

References (46)
  • 10
    • 0027231045 scopus 로고
    • and references cited therein
    • e) Ohler, E.; Kotzinger, S. Synthesis 1993, 497-502 and references cited therein.
    • (1993) Synthesis , pp. 497-502
    • Ohler, E.1    Kotzinger, S.2
  • 37
    • 0343905354 scopus 로고    scopus 로고
    • in press
    • 2O (3.12 g, 8.40 mmol) in THF (100 mL) was sonicated for 30 min at room temperature. To this suspension was then added the above-prepared solution of dilithium binaphthoxide and 0.52 N NaO-t-Buin THF (4.85 mL, 2.52 mmol), dropwise at room temperature. After being stirred vigorously overnight at room temperature and then for 48 h at 50 °C, the reaction mixture was allowed to stand at room temperature. The resulting supernatant was used as an asymmetric catalyst (0.03 M). Sasai, H.; Watanabe, S.; Shibasaki, M. Enantiomer, in press.
    • Enantiomer
    • Sasai, H.1    Watanabe, S.2    Shibasaki, M.3
  • 38
    • 0343469560 scopus 로고    scopus 로고
    • note
    • The absolute configurations of the products except for 12 were determined by the Mosher method.
  • 39
    • 0342599558 scopus 로고    scopus 로고
    • note
    • 3 derived LLB gave 2 in 45% ee (83% yield) even at -78 °C with a slow addition of 1. The optical purity of 2 was increased (74% ee, 88% yield) when pumping dried LLB, all the sol vent of LLB, was removed by pumping up and then redissolved in THF, was utilized as a catalyst.
  • 45
    • 0343033825 scopus 로고    scopus 로고
    • note
    • In the case of ALB catalyzed hydrophosphonylations, slow addition of aldehydes didn't improve ees.
  • 46
    • 11944252146 scopus 로고
    • See, also references 6h and 12a
    • For the discussion of the multifunctional activities of heterobimetallic asymmetric catalysts, see: Sasai, H.; Arai, T.; Satow, Y.; Houk, K. N.; Shibasaki, M. J. Am. Chem. Soc. 1995, 117, 6194-6198. See, also references 6h and 12a.
    • (1995) J. Am. Chem. Soc. , vol.117 , pp. 6194-6198
    • Sasai, H.1    Arai, T.2    Satow, Y.3    Houk, K.N.4    Shibasaki, M.5


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.