Multicomponent Synthesis of Benzothiophen‐2‐acetic Esters by a Palladium Iodide Catalyzed
<i>S</i>
‐cyclization – Alkoxycarbonylation Sequence
作者:Raffaella Mancuso、Melania Lettieri、Ida Ziccarelli、Patrizio Russo、Antonio Palumbo Piccionello、Bartolo Gabriele
DOI:10.1002/adsc.202100782
日期:2021.10.5
S-cyclization-demethylation-alkoxycarbonylation-reduction sequence promoted by the PdI2/KI catalytic system, occurring under relatively mild conditions (40 atm, 80 °C, 15 h). Benzothiophene-2-acetic esters are obtained in moderate to good yields (35–70%) starting from variously substituted substrates in combination with different alcohols as external nucleophiles (17 examples).
介绍了一种从简单的结构单元 [1-(2-(甲硫基) 苯基)prop-2-yn-1-ols、一氧化碳和醇)] 多组分合成苯并噻吩衍生物的催化羰基化方法。它基于PdI 2 /KI 催化系统促进的S -环化 - 去甲基化 - 烷氧基羰基化 - 还原序列,发生在相对温和的条件下(40 个大气压,80°C,15 小时)。苯并噻吩-2-乙酸酯以中等至良好的产率(35-70%)从各种取代的底物与作为外部亲核试剂的不同醇开始(17 个例子)获得。