反应详情

A solution of PdCl2(dppf)-CH2Cl2 adduct (0.349 g, 0.427 mmol), 1-bromo-2-iodo-4-(trifluoromethyl)benzene (1.500 g, 4.27 mmol), tert-butyl 3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,5-dihydro-1H-pyrrole-1-carboxylate (ASW MedChem, Inc., New Brunswick, N.J., 1.893 g, 6.41 mmol), and potassium carbonate (3.54 g, 25.6 mmol) in 15 mL dioxane/7.5 mL water was heated to 100° C. for 1 hour. LC/MS showed product, so the reaction mixture was cooled to room temperature and the aqueous layer was removed. The organics were concentrated then purified directly by reverse phase column chromatography [Redisep Gold C18, 20-100% (0.1% NH4OH in MeOH)/(0.1% NH4OH in water)] yielding tert-butyl 3-(2-bromo-5-(trifluoromethyl)phenyl)-2,5-dihydro-1H-pyrrole-1-carboxylate (1.040 g, 2.65 mmol, 62.0% yield). m/z (ESI) 413.9 (M+Na)+.

1. customthe aqueous layer was removed
2. concentrationThe organics were concentrated
3. customthen purified directly by reverse phase column chromatography [Redisep Gold C18, 20-100% (0.1% NH4OH in MeOH)/(0.1% NH4OH in water)]