反应详情

To a mixture of 1H-pyrrole-3-carboxylic acid ethyl ester (2 g, 14.4 mmol) (synthesized from 1H-pyrrole-3-carboxylic acid suing the same procedure as in Example 30) and 2-chloronicotinoyl chloride (4.4 mg, 25 mmol) in dry benzene (10 mL) at 0° C. was added dropwise a solution of tin (IV) chloride (0.7 g) in dry benzene (5 mL). The mixture was allowed to warm up slowly to room temperature and stirred for overnight. The reaction was diluted with ethyl acetate, washed with brine and concentrated. The residue was purified on a silica gel column to give 402 mg (10%) of 4-(2-chloro-pyridine-3-carbonyl)-1H-pyrrole-3-carboxylic acid ethyl ester.

1. washwashed with brine
2. concentrationconcentrated
3. customThe residue was purified on a silica gel column