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首页> 外文期刊>Catalysis science & technology >Palladium catalytic system for inhibition of O-arylation type reaction and regioselective direct arylation at C2 of phenols
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Palladium catalytic system for inhibition of O-arylation type reaction and regioselective direct arylation at C2 of phenols

机译:钯催化系统抑制O-酰化型反应和苯酚中C2的区域选择性直接芳基化

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摘要

The palladium-catalysed arylation of free OH phenol derivatives proceeds regioselectively either at C2 or at OH with a variety of electron-deficient aryl bromides or heteroaryl bromides. The nature of the base was found to be crucial to control the regioselectivity of the reaction. In the presence of potassium acetate, the direct arylation at C2 is favoured; whereas, under the same reaction conditions, the use of potassium carbonate gave selectively the O-arylation type products.
机译:游离OH苯酚衍生物的钯催化芳基在C2或OH处进行区域选择,并在OH上使用多种电子缺陷型芳基溴化物或杂芳基溴化物进行。 发现碱的性质对于控制反应的区域选择性至关重要。 在存在乙酸钾的情况下,有利于C2处的直接芳基化。 鉴于在相同的反应条件下,碳酸钾的使用有选择性地赋予了O-酰化型产品。

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