Abstract
In the presence of PdCl2[P(n-Bu)3]2 (10 mol%) and ZnEt2, 2-furyl and 2-pyrrolylmethyl acetate were carboxylated with CO2 (1 atm), affording doubly carboxylated products in good yields. In this dearomative
transformation, α,ε-dicarboxylic acids were obtained selectively, in contrast to our
previous report in which α,γ-dicarboxylic acids were selectively produced from 2-indolylmethyl
acetates. In contrast, 5-thiazolylmethyl acetate and naphthylmethyl acetates predominantly
underwent single carboxylation.
Key words
carboxylation - CO
2
- dearomatization - palladium - furan - pyrrole