反应详情

A solution of Example 26A (15 g, 70.2 mmol) in absolute ethanol (200 mL) was treated with a solution of cyanamide (2.95 g, 70.2 mmol) in dry ether (40 mL) and stirred at room temperature for 72 h. The resulting precipitate was filtered and the solution was concentrated to dryness under reduced pressure to give 10.2 g of the title compound.

1. filtrationThe resulting precipitate was filtered
2. concentrationthe solution was concentrated to dryness under reduced pressure