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Volumn 8, Issue 24, 2006, Pages 5653-5655

Catalytic asymmetric transfer hydrogenation of α-ketoesters with hantzsch esters

Author keywords

[No Author keywords available]

Indexed keywords

ALCOHOL DEHYDROGENASE; COPPER; DRUG DERIVATIVE; ESTER; KETONE; NICOTINAMIDE ADENINE DINUCLEOTIDE;

EID: 33845993240     PISSN: 15237060     EISSN: None     Source Type: Journal    
DOI: 10.1021/ol0624373     Document Type: Article
Times cited : (106)

References (80)
  • 1
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    • Jacobsen, E. N, Pfaltz, A, Yamamoto, H, Eds, Springer: Berlin, Germany, Vols
    • (a) Comprehensive Asymmetric Catalysis; Jacobsen, E. N., Pfaltz, A., Yamamoto, H., Eds.; Springer: Berlin, Germany, 1999; Vols. I-III.
    • (1999) Comprehensive Asymmetric Catalysis , vol.I-III
  • 2
    • 0011779578 scopus 로고    scopus 로고
    • 2nd ed, Ojima, I, Ed, Wiley-VCH: New York
    • (b) Catalysis Asymmetric Synthesis, 2nd ed.; Ojima, I., Ed.; Wiley-VCH: New York, 2000.
    • (2000) Catalysis Asymmetric Synthesis
  • 3
    • 33845987164 scopus 로고    scopus 로고
    • Coppola, G. M.; Schuster, H. F. α-Hydroxy Acids in Enantioselective Synthesis; VCH: Weinhein, Germany, 1997.
    • (c) Coppola, G. M.; Schuster, H. F. α-Hydroxy Acids in Enantioselective Synthesis; VCH: Weinhein, Germany, 1997.
  • 5
    • 0026663693 scopus 로고
    • For reviews, see: b
    • For reviews, see: (b) Singh, V. K. Synthesis 1992, 605.
    • (1992) Synthesis , pp. 605
    • Singh, V.K.1
  • 12
    • 0043240879 scopus 로고    scopus 로고
    • and references cited therein
    • (c) Tang, W.; Zhang, X. Chem. Rev. 2003, 103, 3029 and references cited therein.
    • (2003) Chem. Rev , vol.103 , pp. 3029
    • Tang, W.1    Zhang, X.2
  • 39
    • 33749516633 scopus 로고    scopus 로고
    • For the use of the Hantzsch ester as the reductant in asymmetric catalysis by other groups, see: h
    • For the use of the Hantzsch ester as the reductant in asymmetric catalysis by other groups, see: (h) Tuttle, J. B.; Ouellet, S. G.; MacMillan, D. W. C. J. Am. Chem. Soc. 2006, 128, 12662.
    • (2006) J. Am. Chem. Soc , vol.128 , pp. 12662
    • Tuttle, J.B.1    Ouellet, S.G.2    MacMillan, D.W.C.3
  • 68
    • 31444453628 scopus 로고    scopus 로고
    • For a catalytic asymmetric addition reaction to α-ketoester and a similar substrate with alternative metal complexes, see: (a) Kong, J.-R, Ngai, M.-Y, Krische, M. J. J. Am. Chem. Soc. 2006, 128, 718
    • For a catalytic asymmetric addition reaction to α-ketoester and a similar substrate with alternative metal complexes, see: (a) Kong, J.-R.; Ngai, M.-Y.; Krische, M. J. J. Am. Chem. Soc. 2006, 128, 718.
  • 75
    • 0034621977 scopus 로고    scopus 로고
    • For a single example of a chiral Sn-(pybox) complex-catalyzed reduction of an α-ketoester with polymethyl-hydrosiloxane (PMHS), see: Lawrence, N. J.; Bushell, S. M. Tetrahedron Lett. 2000, 41, 4507.
    • For a single example of a chiral Sn-(pybox) complex-catalyzed reduction of an α-ketoester with polymethyl-hydrosiloxane (PMHS), see: Lawrence, N. J.; Bushell, S. M. Tetrahedron Lett. 2000, 41, 4507.
  • 78
    • 33845988473 scopus 로고    scopus 로고
    • General procedure for Cu(II)-bisoxazoline-catalyzed asymmetric transfer hydrogenation of α-ketoesters with Hantzsch esters: To a flame-dried Schlenk tube was added Cu(OTf)2 (18.1 mg, 0.05 mmol) and, S,S)-benzyl-box] 3f (18.1 mg, 0.05 mmol, The mixture was dried under a vacuum for 0.5 h, and distilled anhydrous CHCl3 (2.5 mL) was added. After stirring for 1 h, tert-butyl benzoylformate 1d (103.1 mg, 0.5 mmol) was added and the mixture was cooled to -25 °C. After addition of Hantzsch ester 4b (216.6 mg, 0.7 mmol, the mixture was stirred under argon at the same temperature until disappearance of the starting material (48 h, After conclusion of the reaction, the mixture was washed using H2O and the aqueous layer was extracted with CHCl3. The organic layer was dried (MgSCM, filtered, and concentrated in vacuo to yield the crude product as an off-white solid. Purification by column chromatography (15% EtOAc/ hexanes) gave t
    • 3. The organic layer was dried (MgSCM), filtered, and concentrated in vacuo to yield the crude product as an off-white solid. Purification by column chromatography (15% EtOAc/ hexanes) gave the pure product as a white solid (92.2 mg, 89%), identical in all respects to previously described tert-butyl (S)-mandelate 2d. [α]D +90.7 (c 1.0, MeOH) [[α]D +97.4 (c 1.0, MeOH), for >99:1 er].
  • 79
    • 0033936085 scopus 로고    scopus 로고
    • For reviews of bisoxazoline-Lewis acid complexes as catalysts, see: a
    • For reviews of bisoxazoline-Lewis acid complexes as catalysts, see: (a) Johnson, J. S.; Evans, D. A. Acc. Chem. Res. 2000, 33, 325.
    • (2000) Acc. Chem. Res , vol.33 , pp. 325
    • Johnson, J.S.1    Evans, D.A.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.