反应详情

A solution of Example 1B (4 g, 18.72 mmol)) in absolute ethanol (50 ml) was treated with a 21% sodium ethoxide solution in ethanol (7 ml, 18.72 mmol) and the precipitated sodium chloride was filtered off. The filtrate was then treated with a solution of cyanamide (0.79 g, 18.72 mmol) in absolute ethanol (25 ml) and stirred at room temperature for one hour. The solvent was evaporated under reduced pressure. The residual oil was triturated with ether to afford white crystals that were filtered and dried to yield 2.5 g of product. MS (ESI+) m/z 174 (M+H)+.

1. filtrationthe precipitated sodium chloride was filtered off
2. customThe solvent was evaporated under reduced pressure
3. customThe residual oil was triturated with ether
4. customto afford white crystals that
5. filtrationwere filtered
6. customdried