esters were synthesized by direct carboxylation of various 4and 5-oxo-carboxylic acid derivatives in the presence of chlorosulfonyl isocyanate in excellent yield under mild conditions. Additionally, optimization conditions were examined for synthesis β-keto esters. Finally, it has been found that trifluoroacetic acid is efficient in DCM under optimized conditions. This efficient one-pot novel method
在
氯磺酰基
异氰酸酯的存在下,通过各种 4-和 5-氧代-
羧酸衍
生物的直接羧化反应合成了 β-
酮酯,在温和条件下以优异的产率合成。此外,还检查了合成 β-
酮酯的优化条件。最后,已发现
三氟乙酸在优化条件下在 DCM 中是有效的。这种高效的一锅新方法对β-
酮酯非常有用、价格公道且易于处理。