Regioselective Synthesis of 2,5-Disubstituted Pyrroles via Stepwise Iododesilylation and Coupling Reactions
Qixin Yu A , Xiaoyu Li B , Xinyue Wang A and Jianhui Liu A C DA School of Petroleum and Chemical Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology at Panjin, Panjin 124221, China.
B Dalian Dechang Pharmaceutical Company, Distribution Branch of Medicine, Hutan Road No. 11, Zhongshan District, Dalian 116015, Liaoning Province, China.
C State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
D Corresponding author. Email: liujh@dlut.edu.cn
Australian Journal of Chemistry 71(3) 95-101 https://doi.org/10.1071/CH17341
Submitted: 16 June 2017 Accepted: 2 October 2017 Published: 27 October 2017
Abstract
A new protocol has been developed for the regioselective preparation of 2,5-disubstituted pyrroles. This approach is based on a stepwise iododesilylation and a subsequent coupling reaction, involving a 6-step pathway starting from the simplest pyrrole. A variety of 2,5-disubstituted pyrrole derivatives are accessible in moderate to good yields. In this study, the protection group for the pyrrole nitrogen is carefully chosen and N,N-dimethylaminosulfonyl is the final choice, which facilitates the subsequent double lithiation and makes the pyrrole moiety more stable. However, the attempted removal of this group fails under several different conditions. Instead, unexpected dimethylaminosulfonyl migration to the β-position of the pyrrole ring in the presence of tetrabutylammonium fluoride is observed.
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