反应详情

The preparation of the title compound takes place in analogy to the synthesis of the compound from Example 20A starting with the compound from Example 5A. Instead of using ethyl acetate, the crude product is extracted with dichloromethane and reacted further without chromatographic purification. 447 mg (98% of theory) of the title compound are obtained.

1. extractionInstead of using ethyl acetate, the crude product is extracted with dichloromethane
2. customreacted further without chromatographic purification