Additional file 1. Experimental details and spectroscopic data of the intermediates 3–4 and the title compounds 5–9. Which includes the experimental procedure and the 1H NMR of intermediates (3a-3d and 4a-4d), the experimental protocols and the spectroscopic data of title compounds 5, 6, 7a-7a, 8, and 9a-9d. All the copies of 1H NMR and 13C NMR for the title compounds were also presented in this additional file.
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