反应详情

A solution of N-(1-benzylpiperid-4-yl)-2-methoxy-4-amino-5-nitrobenzamide (3.8 g; 0.01 mol) [prepared as described in Example 1] in methylene chloride (70 ml) was added to another solution of boron tribromide (2.84 ml; 0.03 moles) in methylene chloride (20 ml). The mixture was stirred at room temperature for 24 hours and then poured into a mixture of a saturated solution of sodium bicarbonate in water (250 ml) and methylene chloride (100 ml). The decanted organic solution was dried and the solvent removed in vacuo to give a paste which was triturated with petroleum ether. The residue obtained was treated with a saturated solution of ethanolic hydrogen chloride to give 3 g of N-(1-benzylpiperid-4-yl)-2-hydroxy-4-amino-5-nitrobenzamide hydrochloride, m.p. 248°-250° C. (dec).

1. customThe decanted organic solution was dried
2. customthe solvent removed in vacuo
3. customto give a paste which
4. customwas triturated with petroleum ether
5. customThe residue obtained