A new and efficient protocol for the synthesis of 2-hydroxybenzophenone derivatives through [5C+1C] annulation of α-alkenoyl-α-aroyl ketene dithioacetals and nitroalkanes had been developed. In the presence of 1 equivalent of K₂CO₃ in DMF at 70 °C, a range of α-alkenoyl-α-aroyl ketene dithioacetals smoothly react with nitroalkanes to provide various 2-hydroxy benzophenone derivatives in excellent yields. The protocol featured mild reaction conditions, no the formation of by-products, excellent yield, no involving the problems of both chemoselectivity and regioselectivity and wide substrate scope.

中文翻译：

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通过α-烯酰基-α-芳酰基乙烯酮二硫缩醛和硝基烷烃的[5C + 1C]环化制备2-羟基二苯甲酮衍生物的新方法

开发了一种通过 α-烯酰基-α-芳酰基烯酮二硫缩醛和硝基烷烃的 [5C+1C] 环化合成 2-羟基二苯甲酮衍生物的新的有效方案。在70°C 下，在 DMF 中存在 1 当量 K ₂ CO ₃时，一系列 α-烯酰基-α-芳酰基乙烯酮二硫缩醛与硝基烷烃顺利反应，以优异的产率提供各种 2-羟基二苯甲酮衍生物。该方案反应条件温和，无副产物生成，收率高，不存在化学选择性和区域选择性并存的问题，底物范围广。