磷钨酸催化离子液体中2-甲氧基萘与乙酸酐的Friedel-Crafts酰化

Q4 Chemistry Bulgarian Chemical Communications Pub Date : 2019-01-01 DOI:10.34049/BCC.51.2.4449

Y. Guo, J. Sun, F. Guo, Yu He, P. Chen

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引用次数: 0

摘要

以磷钨酸(H3PW12O40)为催化剂，在离子液体(IL)四氟硼酸丁吡啶([BPy]BF4)中进行了2-甲氧基萘(2-MN)与乙酸酐(AA)的Friedel-Crafts酰化反应。[BPy] bf4介导的2-MN酰化反应对1-酰基-2-甲氧基萘(1-AC-2-MN)具有良好的转化率和选择性，在最优条件下，2-MN的转化率为70.4%，对1-AC-2-MN的选择性为96.4%。由于1- ac -2- mn的重排，反应1 h后可以检测到6-酰基-2-甲氧基萘(6-AC-2-MN)，在该反应条件下，6-AC-2-MN的收率最高，为11.3%。该体系可循环使用至少6次，活性无明显损失，表明H3PW12O40/[BPy]BF4催化体系稳定性好。

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Friedel-Crafts acylation of 2-methoxynaphthalene with acetic anhydride catalyzed by phosphotungstic acid in ionic liquid

The Friedel-Crafts acylation of 2-methoxynaphthalene (2-MN) with acetic anhydride (AA) was carried out in the ionic liquid (IL) butylpyridinium tetrafluoroborate ([BPy]BF4) using phosphotungstic acid (H3PW12O40) as the catalyst. The [BPy]BF4-mediated 2-MN acylation displays good conversion and selectivity towards 1-acyl-2-methoxynaphthalene (1-AC-2-MN), with 70.4% conversion of 2-MN and 96.4% selectivity to 1-AC-2-MN obtained under the optimal conditions. Owing to the rearrangement of 1-AC-2-MN, 6-acyl-2-methoxynaphthalene (6-AC-2-MN) can be detected after 1 h of reaction time, with the highest 6-AC-2-MN yield of 11.3% obtained under the examined reaction conditions. The system can be recycled and reused at least 6 times without significant loss of activity, indicating the good stability of the H3PW12O40/[BPy]BF4 catalytic system.

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