DTBB-Catalysed Lithiation of Acenaphthylene and Reaction with Carbonyl Compounds

Abstract

The reaction of acenaphthylene with an excess of lithium powder and a catalytic amount of DTBB (7.5 mol%) in tetrahydrofuran at -70 °C followed by treatment with a carbonyl compound [Me₂CO, Et₂CO, i-Pr₂CO, (c-C₃H₅)₂CO, cyclopentanone, cyclohexanone, 2-adamantanone, Ph₂CO, t-BuCHO] leads, after hydrolysis with water, to an easily chromatographically separable mixture of two products resulting from disubstitution at the 1,2-positions and monosubstitution at the 1-position, respectively. The reaction is regio- and stereoselective, so in the case of the disubstituted compounds only the trans-diastereomers are obtained.

DTBB-catalysed lithiation - acenaphthylene - 1,2-diols - dianionic species

References

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<A NAME="RZ29507SS-12">12</A>

The lithiation of acenaphthylene in tetrahydrofuran, with or without liquid ammonia, followed by trapping of the anionic intermediates with an alkyl halide leads mainly to substitu-tion at position 1 or 5, respectively (see reference 7h).

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In reference 10b, the lithiation of acenaphthene (4) with an excess of n-butyllithium, followed by treatment with benzophenone, gave 32% of a diol resulting from 1,5-disubstitution. The physical and spectroscopic data of this diol coincide with those of our compound 6h in which the electrophilic fragments occupy the 1,2-positions.

<A NAME="RZ29507SS-15A">15a</A>

Crystal data, excluding structure factors, have been deposited at the Cambridge Crystallographic Data Centre as supplementary publication numbers as follows [copies of the data can be obtained, free of charge, on application to CCDC, 12 Union Road, Cambridge CB2 1EZ, UK; Fax: [phone]; E-mail: [e-mail]]: 6c, CCDC 667608: C₂₆H₃₈O₂, M = 382.56, tetragonal, space group I4₁/a, Z = 8, a = 10.2698(9) Å, b = 10.2698(9) Å, c = 42.579(7) Å, V = 4490.7(10) ų, D _c = 1.132 Mg·m^-3, λ = 0.71073 Å, µ = 0.069 mm^-1, F(000) = 1680, T = 25±1 °C; 6d, CCDC 667607: C₂₆H₃₀O₂, M = 374.50, monoclinic, space group P2₁/c, a = 12.179(3) Å, b = 7.5565(17) Å, c = 22.867(5) Å, β = 100.135(5)°, V = 2071.6(8) ų, Z = 4, D _c = 1.201 Mg·m^-3, λ = 0.71073 Å, µ = 0.074 mm^-1, F(000) = 808, T = 23±1 °C; 6f, CCDC 667606: C₂₄H₃₀O₂, M = 350.22, impure with C₁₂H₂₂O₂, triclinic, space group P1, a = 10.7269(12) Å, b = 10.9803(12) Å, c = 11.9786(13) Å, α = 69.905(2)°, β = 68.552(2)°, γ = 77.201(2)°, V = 1225.8(2) ų, Z = 2, D _c = 1.218 Mg·m^-3, λ = 0.71073 Å, µ = 0.076 mm^-1, F(000) = 490, T = 25±1 °C; 6h, CCDC 667609: C₃₈H₃₀O₂, M = 518.62, triclinic, space group P1, a = 11.448(3) Å, b = 13.297(4) Å, c = 18.863(5) Å, α = 105.589(5)°, β = 90.034(7)°, γ = 91.261(6)°, V = 2765.0(13) ų, Z = 4, D _c = 1.246 Mg·m^-3, λ = 0.71073 Å, µ = 0.075 mm^-1, F(000) = 1096, T = 25±1 °C. Data collection was performed on a Bruker CCD-Apex diffractometer, based on three ω-scan runs (starting = -34°) at values φ = 0°, 120° and 240° with the detector at 2θ = -32°. For each of these runs, 606 frames were collected at 0.3° intervals and 20 s per frame. An additional run at φ = 0° of 100 frames was collected to improve redundancy. The diffraction frames were integrated using the program SAINT^15b and the integrated intensities were corrected for Lorentz polarisation effects with SADABS.^15c The structure was solved by direct methods^15d and refined to all 2463 unique F _o ² by the full-matrix least-squares technique.^15d All the hydrogen atoms were placed at idealised positions and refined as rigid atoms. Final wR ₂ = 0.1300 for all data and 246 parameters; R ₁ = 0.0424 for 2051 F _o > 4σ(F _o).

<A NAME="RZ29507SS-15B">15b</A> SAINT Version 6.02A: Area-Detector Integration Software   Siemens Industrial Automation, Inc.; Madison WI: 1995. 

<A NAME="RZ29507SS-15C">15c</A> Sheldrick GM. SADABS: Area-Detector Absorption Correction   University of Göttingen; Göttingen Germany: 1996. 

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<A NAME="RZ29507SS-17">17</A> To the best of our knowledge, there is only one case reported in the literature in which the lithiation of acenaphthylene(1) in the presence or absence of liquid ammonia, followed by treatment with iodomethane, gave 1,2-disubstitution, in 33% yield; see: Usami S. Hasegawa K. Kato T. Nakamura S. Tsukashima H. Nenryo Kyokaishi  1986,  65:  996 ; Chem. Abstr. 1987, 106, 159278

<A NAME="RZ29507SS-18">18</A>

As this compound was isolated in a very low yield, and the isolated product was ca. 70% pure (by GLC), the ¹H and ¹³C NMR assignments were difficult to undertake.