Abstract
AbstractThe compound, 2H‐pyrrole, is a key scaffold contained in natural products, bioactive compounds, pharmaceuticals, and organic functional materials. However, the development of efficient synthetic strategies for 2H‐pyrroles is challenging. This is because 2H‐pyrroles, owing to their nonaromatic nature, are easily converted into the thermodynamically more stable 1H‐pyrroles. Recently, efficient and straightforward synthetic strategies for 2H‐pyrroles have been developed, including the dearomatization of 1H‐pyrrole, oxidation of pyrrolines or pyrrolidines, ring construction via catalytic cycloaddition, and rearrangement of 3H‐pyrroles. In this review, we summarize the progress in the research on 2H‐pyrrole synthesis since 2000 and briefly discuss the synthesis reaction mechanisms.
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