Synthesis of 5-Arylmethylene-1,3-dioxolan-4-ones and β-Aryl-α-keto Carboxylic Acids 2-Trichloromethyl-1,3-dioxolan-4-one (1) in silylation by trimethylsilyl triflate (2) yields 2-trichloromethyl-4-trimethylsiloxy-5-trimethylsilyl -1,3-dioxole (3). The cyclic ketene acetal 3 is converted to the title dioxolanones 6 in reaction with aromatic aldehydes catalyzed by 2. Hydrolysis of dioxolanones 6 affords arylpyruvic acids 7.
5-芳基亚甲基-
1,3-二氧戊烷-4-酮和β-芳基-α-
酮羧酸的合成 2-三
氯甲基-
1,3-二氧戊烷-4-酮(1)在三甲基
硅基
三氟甲磺酸酯(2)的
硅化反应中生成2-三
氯甲基-4-三甲基
硅氧基-5-三甲基
硅基-1,3-二氧杂环(3)。环状烯酮
缩醛3与芳香醛反应,经过催化剂2的催化转化为标题的二氧杂环酮6。二氧杂环酮6的
水解产生芳基
丙酮酸7。