反应详情

18 mL of trifluoroacetic acid was added under ice cooling to a 60 mL chloroform solution of 5.98 g of the compound obtained in step 2-3, and the reaction mixture was stirred for 2 hours at the same temperature. After this, the solvent was distilled off under reduced pressure to obtain 12.1 g of residue (colorless oily substance). This compound was used in the following reaction without being purified.

1. distillationAfter this, the solvent was distilled off under reduced pressure