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column chromatography (20 g of silica gel, 2:3 ethyl acetate/hexane) gave 0.21 g (60%) of 20b as a pale yellow oil, pure by GC (2% Carbowax 20M at 200 °C): bp 155-160 °C (3 mm); NMR (CDC13) 5 1.47 (d, 3 H, CH3), 3.08 (s, 3 H, NCH3), 3.48 (q, 1 H, CH), 4.43 (dd, 2 H, ArCH2N), 7.00-7.43 (m, 4 H, aromatic); IR (5% solution in CHC13) 1710 cm"1 (C=0); m/e (relative intensity) 175 (M+, 42), 118 (100), 117 (65).4-Ethyl-2-methyl-l,3-dihydro-3(2//)-isoquinolinone (20c). From 0.45 g of 19c, 0.24 g of crude product was obtained as an orange oil. Short column chromatography (30 g of silica gel, 1:9 acetone/hexane) gave 0.20 g (54%) of 20c as a yellow oil, pure by GC (2% Carbowax 20M at 200 °C): NMR (CDC13) 0.84 (t, 3 H, CH3), 1.87 (m, 2 H, CH2), 3.12 (s, 3 H, NCH3), 3.48 (t, 1 H, CH), 4.50 (dd, 2 H, ArCH2N), 7.07-7.53 (m, 4 H, aromatic); IR (5% solution in CHC13) 1710 cm"1

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