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Crystallographic data for the structure of 3a reported in this paper has been deposited at the Cambridge Crystallographic Data Centre as supplementary publication with No. CCDC-270287, Copies of available material can be obtained, free of charge, on application to the Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK, (fax: +44-(0) 1223-336033 or e-mail: deposit@ccdc.cam.ac.uk). X-ray crystallography for 3a: Empirical formula C16H16N2O3, FW = 284.31, T = 289(2) K, triclinic, space group P-1, a = 8.1402(16) Å, b = 9.3393(19) Å, c = 11.206(2) Å, α = 107.047(3) °, β = 103.066(4) °, γ = 106.257(3) °, V = 736.5(3) Å3, Z = 2, Dc = 1.282 Mg/m3, λ(MoKα) = 0.71073 Å, μ = 0.090 mm−1, F(000) = 300. 2.46 ° < θ < 25.00 °, S = 0.968, Largest diff. Peak and hole: 0.152 and −0.154 e. Å−3 The structure was solved by direct method using SHELXTL17 program and expanded using Fourier technique. The non-hydrogen atoms were refined anisotropically, the hydrogen atoms were positioned geometrically and refined as riding except for H1A and H1B. A full-matrix least-squares refinement gave final R = 0.0436 and ωR = 0.1020 with ω = 1/[σ2 (Fo2) + (0.056P)2], where P = (Fo2 + 2Fc2)/3.
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