Toluene → benzyl (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline-2-carboxylate

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A 25.0 g portion of (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline and 24.5 g of benzyl chloride carbonate were added to a mixture of 125 ml of toluene, 19.8 g of potassium carbonate and 75 ml of water and stirred at 20° C. for 4 hours, and the organic layer was washed with 75 ml of water. The thus obtained organic layer was concentrated under a reduced pressure, purified by a silica gel column chromatography and then dried to obtain 38.0 g of (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline-2-carboxylic acid benzyl ester (1H-NMR (DMSO-d6, tetramethylsilane internal standard): δ 2.73-2.83 (1H, m), 2.84-2.94 (1H, m), 3.31-3.41 (1H, m), 3.86-3.96 (1H, m), 5.12 (1H, d, J=12.8 Hz), 5.18 (1H, d, J=12.8 Hz), 6.28 (1H, s), 7.10-7.38 (14H, m), mass spectrum: m/z=344 [M+H]+ (FAB)).

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