5 or 6 Nitrobenzo imidazole

The experimental results showed that high-purity ABA was one-pot synthesized from methyl 4-(5-nitro-6-hydroxybenzoxazole-2-yl)benzoate(MNB) via K2CO3 hydrolysis and Na2S2O4 reduction with yield of 78.

结果表明:采用以4-(5-硝基-6-羟基-2-苯并噁唑基)苯甲酸甲酯(MNB)为原料,经碳酸钾水解、连二亚硫酸钠还原—锅法合成高纯度ABA的新工艺,具有工艺简练、操作安全以及良好的经济性等特点,避开了原路线中昂贵的Pd/C催化剂和残留溶剂的阻聚效应,纯度达98%,总收率78。