Synthesis 2021; 53(21): 4030-4041
DOI: 10.1055/a-1526-7839
feature

Facile Synthesis of Polysubstituted 2-Pyrones via TfOH-Mediated Ring Expansion of 2-Acylcyclopropane-1-carboxylates

Jiru Shao
a   Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, P. R. of China
,
Caiyun An
a   Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, P. R. of China
,
a   Chang-Kung Chuang Institute, School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Lu, Shanghai 200241, P. R. of China
b   Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, 3663 North Zhongshan Lu, Shanghai 200062, P. R. of China
› Author Affiliations
This work was sponsored by the Shanghai Pujiang Program (Grant No. 19PJ1402700), the Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning, the National Natural Science Foundation of China (No. 22071059), and the East China Normal University (ECNU).


Abstract

A facile route to polysubstituted 2-pyrones from readily available 2-acylcyclopropane-1-aryl-1-carboxylates mediated by TfOH is reported. The strongly donating 1-aryl group is important for directing the C–C bond cleavage of the donor-acceptor cyclopropane ring, which then leads to the formation of the 2-pyrone ring through lactonization.

Supporting Information



Publication History

Received: 19 May 2021

Accepted after revision: 10 June 2021

Accepted Manuscript online:
10 June 2021

Article published online:
08 July 2021

© 2021. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany