- Antitumor drug lenalidomide intermediate preparation method
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The invention discloses an antitumor drug lenalidomide intermediate preparation method. The preparation method comprises the following steps: 1) under existence of cuprous iodide and organic alkali, performing contact reaction between 4-nitro indoline and 3-bromine-2,6-piperidine to obtain 3-(4-nitro-1,3-xylylenimine-2-yl)piperidine-2,6-diketone; 2) performing oxidizing reaction on the 3-(4-nitro-1,3-xylylenimine-2-yl)piperidine-2,6-diketone obtained in the step 1) to obtain lenalidomide intermediate of 3-(4-nitro-1-oxo-1,3-xylylenimine-2-yl)piperidine-2,6-diketone. The method disclosed by the invention has obviously smaller steps, the raw materials are easy to obtain, a yield is also improved, and the method is more suitable for industrial production.
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