反应详情

367 mg (0.818 mmol) of Compound 56 obtained in Example 56 was dissolved in 10 ml of ethanol, 1.23 ml of a 2N aqueous solution of sodium hydroxide was added and the mixture was stirred at room temperature for 17 hours. The precipitated crystals were collected by filtration to give 261 mg (69%) of Compound 57.

1. filtrationThe precipitated crystals were collected by filtration