3-Methoxyaniline → (S)-2-amino-4'-fluoro-7'-(3-methoxyphenylamino)-5H-spiro[oxazole-4,9'-xanthen]-2'-ol

関与物質

反応条件

反応手順

A vial was charged with (S)-2-amino-7′-bromo-4′-fluoro-5H-spiro[oxazole-4,9′-xanthen]-2′-ol (400 mg, 1.095 mmol), di-tert-butyl(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphine (81 mg, 0.192 mmol), Pd2 dba3 (50.2 mg, 0.055 mmol), sodium tert-butoxide (316 mg, 3.29 mmol) and 3-methoxyaniline (245 μL, 2.191 mmol). Toluene (2191 μL) was added and the vial was flushed with argon, sealed and shaken to combine all the components. The resulting dark mixture was heated at 100° C. for 16 hrs. The mixture was diluted with water (5 ml) and ethyl acetate (15 ml) and neutralized with saturated NH4Cl solution. The organic layer was loaded onto a 5 g SCX column and washed with EtOAc and MeOH. The material was recovered from the column by washing with 2M NH3 in MeOH. Concentration and separated by silica gel chromatography (10-80% CH2Cl2/MeOH/NH4OH in CH2CO provided (S)-2-amino-4′-fluoro-7′-(3-methoxyphenylamino)-5H-spiro[oxazole-4,9′-xanthen]-2′-ol (230 mg, 0.565 mmol, 51.5% yield). MS m/z=408.0 [M+H].

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