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In a CEM microwave vial with a stir-bar (optional), the nitroaniline (0.36 mmol), carboxylic acid (1.03 mL, 0.35 M), and SnCl2Æ2H2O (3.0 equiv) were combined and heated at 130 C (125 W, 1.0 min ramp time) for 5 min. After cooling, the reaction mixture was diluted with water (4 mL) and neutralized with 50% aq NaOH (pH = 7.0 ¡À 0.5). It was extracted with ethyl acetate (3 ¡¤ 4 mL) and the combined organic phases were dried (Na2SO4), filtered and evaporated under reduced pressure. The crude product was analyzed by HPLC/MS/ CLND and purified by passing through a plug of silica gel (500 mg prepacked columns) using 30 mL of ethyl acetate. Compounds with purity below 95% were further purified using the ISCO CombiFlash 16sqx with a gradient of either 5¨C100% EtOAc¨Chexanes or 0¨C20% DCM¨C MeOH (5, 13, and 21). |
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4Â¥2009-04-24 22:58:31
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