Synlett 2019; 30(07): 841-844
DOI: 10.1055/s-0037-1612414
letter
© Georg Thieme Verlag Stuttgart · New York

Catalytic Carboxylation of Heteroaromatic Compounds: Double and Single Carboxylation with CO2

Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan   Email: tmita@pharm.hokudai.ac.jp   Email: biyo@pharm.hokudai.ac.jp
,
Hiroki Masutani
,
Sho Ishii
,
Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812, Japan   Email: tmita@pharm.hokudai.ac.jp   Email: biyo@pharm.hokudai.ac.jp
› Author Affiliations
This work was financially supported by the Japan Society for the Promotion of Science (Grant-in-Aid for Scientific Research, No. 18K05096), the Naito Foundation, the Takeda Science Foundation, and the Sumitomo Foundation.
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Publication History

Received: 05 February 2019

Accepted after revision: 19 February 2019

Publication Date:
19 March 2019 (online)


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.

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