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Volumn 65, Issue 17, 2000, Pages 5403-5408

Homologation of boronic esters with (dialkoxymethyl)lithiums. Asymmetric synthesis of α-alkoxy boronic esters

Author keywords

[No Author keywords available]

Indexed keywords

BORON DERIVATIVE;

EID: 0034714568     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo000457r     Document Type: Note
Times cited : (17)

References (74)
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    • note
    • (a) From α-alkoxyorganostannanes: ref 2.
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    • (b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
    • (1986) J. Org. Chem. , vol.51 , pp. 3150-3155
    • Brown, H.C.1    Singh, S.M.2    Rangaishenvi, M.V.3
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    • (b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
    • (1991) Synlett , pp. 631-632
    • Michnick, T.J.1    Matteson, D.S.2
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    • (b) Brown, H. C.; Singh, S. M.; Rangaishenvi, M. V. J. Org. Chem. 1986, 51, 3150-3155. (Bromomethyl)lithium: Michnick, T. J.; Matteson, D. S. Synlett 1991, 631-632. (Iodomethyl)lithium: Wallace, R. H.; Zong, K. K. Tetrahedron Lett. 1992, 33, 6941-6944.
    • (1992) Tetrahedron Lett. , vol.33 , pp. 6941-6944
    • Wallace, R.H.1    Zong, K.K.2
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    • (b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
    • (1994) Tetrahedron Lett. , vol.35 , pp. 8961-8964
    • Soundararajan, R.1    Li, G.2    Brown, H.C.3
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    • (b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
    • (1990) Heteroatom Chem. , vol.1 , pp. 65-74
    • Matteson, D.S.1    Hurst, G.D.2
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    • (b) Soundararajan, R.; Li, G.; Brown, H. C. Tetrahedron Lett. 1994, 35, 8961-8964. (1,1-Dichloroethyl)lithium: Matteson, D. S.; Hurst, G. D. Heteroatom Chem. 1990, 1, 65-74. [(Chloroaryl)-methyl]lithium: Kabalka, G. W.; Li, N.-S.; Yu, S. Tetrahedron: Asymmetry 1997, 8, 3843-3846.
    • (1997) Tetrahedron: Asymmetry , vol.8 , pp. 3843-3846
    • Kabalka, G.W.1    Li, N.-S.2    Yu, S.3
  • 42
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    • For reviews, see: (a) Matteson. D. S. Tetrahedron 1998, 54, 10555-10607.
    • (1998) Tetrahedron , vol.54 , pp. 10555-10607
    • Matteson, D.S.1
  • 43
    • 0343246424 scopus 로고    scopus 로고
    • note
    • (b) Reference 14a, Chapter 5.
  • 55
    • 84878585406 scopus 로고    scopus 로고
    • The Chemical Abstracts name for (+)-or (S)-pinanediol is [1S-(1α,2β,3β,5α)]-2,6,6-trimethylbicyclo[3.1.1]heptane-2, 3-diol.
    • Chemical Abstracts
  • 56
    • 0342811751 scopus 로고    scopus 로고
    • note
    • The same chemical shift was observed when 4a was treated with lithium ethoxide in THF.
  • 57
    • 0343682040 scopus 로고    scopus 로고
    • note
    • The same NMR study was realized with the (+)-pinanediol methylboronate 1g. The migration of the methyl group was observed at an upper temperature to -60°C.
  • 60
    • 0343246419 scopus 로고    scopus 로고
    • note
    • An excess of zinc chloride is also required during the Matteson homologation with compounds containing oxygen functionality. Reference 8a.
  • 61
    • 0342811747 scopus 로고    scopus 로고
    • note
    • A mixture of 4a, lithium ethoxide and zinc chloride in THF was stirred overnight at room temperature. No detectable epimerization is observed only a small degradation of the product (∼2%).
  • 62
    • 0343246416 scopus 로고    scopus 로고
    • note
    • Systematic names of 4: 4a, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy) phenylmethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4b, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)(4- bromophenyl)methyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2- benzodioxaborole; 4c, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)(1- naphthyl)methyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4e, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)-2- methylethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4f, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)-heptyl] hexahydro-3a,5,5-trimethyl-4,6-methano-1,3,2-benzodioxaborole; 4g, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(ethoxy)ethyl] hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4h, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(methoxy) phenylmethyl]hexahydro-3a,5,5-trimethyl-4-6-methano-1,3,2-benzodioxaborole; 4i, {3aS-[2(R*),3aα,4β,6β,7aα]}-2-[1-(methoxy)ethyl] hexahydro-3a,5,5-trimethyl-4,6-methano-1,3,2-benzodioxaborole. The 3aS designates the absolute configuration of the entire molecule by reference to carbon 3a. The 2(R*) indicates that this is the enantiomer in which the side chain at position 2 would have the R configuration if position 3a were R, but since position 3a is S, the side chain is S.
  • 63
    • 0343246415 scopus 로고    scopus 로고
    • note
    • 7a with lithium ethoxide.
  • 64
    • 0343682037 scopus 로고    scopus 로고
    • note
    • The α-ethoxy derivative 4d was obtained from the (+)-pinanediol 1-hexenylboronate without Lewis acid in 14% de, yield 50%.
  • 65
    • 0342376840 scopus 로고    scopus 로고
    • note
    • No quantitative study of migratory aptitudes was carried out in homologation reaction, contrary to the oxidative deboronation. However, certain brief replies are given in the ref 15a.


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