Ethyl Acetate → 3-methyl-5-[3-(2-morpholin-4-yl-ethylamino)-propyl]-1H-pyrrole-2,4-dicarboxylic acid 2-tert-butyl ester 4-ethyl ester

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Reaction Steps

5-(3-Methanesulfonyloxy-propyl)-3-methyl-1H-pyrrole-2,4-dicarboxylic acid 2-tert-butyl ester 4-ethyl ester 1 g (5.812 g, 15 mmol) obtained from step 6 of Example 1 and 2-morpholin-4-yl-ethylamine (10.725 g, 82.5 mmol) was dissolved in water bath at 30° C. and stirred for 5.5 hours at room temperature. After thin lay chromatography showed the disappearance of starting materials, the reaction mixture was added with ethyl acetate (100 ml) and saturated brine (100 ml), stirred for 5 minutes, and separated into layers. The organic phase was washed with saturated brine (100 ml×4), dried over anhydrous magnesium sulfate, filtered to remove the drying agent and concentrated under reduced pressure. The residue was purified by silica gel column chromatography to obtain 3-methyl-5-[3-(2-morpholin-4-yl-ethylamino)-propyl]-1H-pyrrole-2,4-dicarboxylic acid 2-tert-butyl ester 4-ethyl ester 10a (2.238 g, yield 87%) as a light yellow oil.

Provenance & Evidence