Ethyl Acetate → 2-Cyclopropyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline-6-carbaldehyde

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Reaction Steps

A solution of 2-cyclopropyl-6-hydroxymethyl-4,4-dimethyl-1,2,3,4-tetrahydroisoquinoline (Intermediate 24, 0.74 g, 3.2 mmol) in dichloromethane (10 mL) and acetonitrile (2.5 mL) was treated sequentially with 4A° molecular sieves powder (1.06g), tetra-n-propyl ammonium perruthenate (0.050 g, 0.14 mmol) and N-methyl morpholine N-oxide (1.1 g, 9.8 mmol). After stirring at ambient temperature for 0.5 h, it was diluted with 5 mL of hexane and subjected to flash column chromatography over silica gel (230-400 mesh) using 10% ethyl acetate in hexane as the eluent to afford the title compound as an oil (0.27 g, 37%).

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