Cesium carbonate → tert-Butyl [1-(4-chlorobenzyl)-7-{3-[(propylsulfonyl)amino]propyl}-1,2,3,4-tetrahydronaphthalen-2-yl]carbamate

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Reaction Steps

To a solution of 9-BBN (0.5 M in tetrahydrofuran, 8.85 mL, 4.42 mmol) was added dropwise a solution N-allylpropane-1-sulfonamide (1152 mg, 7.06 mmol) in tetrahydrofuran (1 mL) a 0° C. After stirring at 0° C. to 5° C. for 3.5 hours dioxane (25 mL) was added followed by 7-(tert-butoxycarbonylamino)-8-(4-chlorobenzyl)-5,6,7,8-tetrahydronaphthalen-2-yl trifluoromethanesulfonate (1000 mg, 1.923 mmol, prepared analogously to example 34.3), palladium acetate (43.2 mg, 0.192 mmol), triphenylphosphine (101 mg, 0.385 mmol) and cesium carbonate (1253 mg, 3.85 mmol). The yellow reaction mixture was heated under reflux for 3 hours. The reaction mixture was diluted with ethyl acetate (60 mL) and washed with water (2×40 mL). The organic layer was dried and concentrated in vacuo. The crude product was purified by flash chromatography (silica gel, dichloro methane, methanol). Yield: 854 mg (1.596 mmol, 83%).

Provenance & Evidence