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General Experimental Procedure A mixture of the aniline (5 mmol, aldehyde (5 mmol, dihydropyran or dihydrofuran (7 mmol, Mg(ClO 4)2 (0.25 mmol, 5 mol, in MeCN (2 mL) was stirred at r.t. for an appropriate time (Table 1, After completion of the reaction, as indicated by TLC, the reaction mixture was diluted with EtOAc (2 x 10 mL) and washed with H2O (2 x 10 mL) followed by brine (2 x 15 mL, The combined organic extracts were dried over Na2SO4, concentrated in vacuo and purified by column chromatography on silica gel (Merck, 100-200 mesh; EtOAc-hexane, 1:9) to afford the pure pyrano- or furanoquinoline. Spectral data of selected compounds: Compound 4j: IR (KBr, 3325 cm-1. 1H NMR (200 MHz, CDCl3, δ, 1.35 (m, 1 H, 1.50 (m, 1 H, 1.65 (m, 1 H, 1.85 (m, 1 H, 2.15 (m, 1 H, 3.75 (m, 1 H, 3.90 (br s, 1 H, 4.15 (m, 1 H, 4.40 (d, J, 2.8 Hz, 1 H, 4.70 d, J
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