We have developed a high-efficiency and practical Cu-catalyzed cross-coupling to directly construct versatile α-aryl-esters by utilizing readily available aryl bromides (or chlorides) and malonates. These gram-scale approaches occur with turnovers of up to 1560 and are smoothly conducted by the usage of a low catalyst loading, a new available ligand, and a green solvent. A variety of functional groups
by using a simple 2,2′-biphenol-derived phosphoric acid catalyst (2.5–10 mol%). This reaction was also successfully conducted at the gram scale. To demonstrate the synthetic utility of this catalytic system, pharmaceutically useful substrates and acid-sensitivesubstrates were examined using these acid–base cooperative phosphoric acid catalysts, which exhibit relatively weak Brønsted acidity.
通过使用简单的 2,2'-联苯酚衍生的磷酸催化剂(2.5–10 mol%),在 100 °C 下促进了羧酸和伯醇或仲醇的等摩尔混合物在甲苯中的脱水酯化反应,无需除去水。 )。该反应也在克级上成功进行。为了证明该催化系统的合成效用,使用这些酸碱协同磷酸催化剂对药学上有用的底物和酸敏感底物进行了检查,这些催化剂表现出相对较弱的布朗斯台德酸性。