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Last Decade of Unconventional Methodologies for the Synthesis of Substituted Benzofurans
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Last Decade of Unconventional Methodologies for the Synthesis of Substituted Benzofurans
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Journal Article
Last Decade of Unconventional Methodologies for the Synthesis of Substituted Benzofurans
2020
Overview
This review describes the progress of the last decade on the synthesis of substituted benzofurans, which are useful scaffolds for the synthesis of numerous natural products and pharmaceuticals. In particular, new intramolecular and intermolecular C–C and/or C–O bond-forming processes, with transition-metal catalysis or metal-free are summarized. (1) Introduction. (2) Ring generation via intramolecular cyclization. (2.1) C7a–O bond formation: (route a). (2.2) O–C2 bond formation: (route b). (2.3) C2–C3 bond formation: (route c). (2.4) C3–C3a bond formation: (route d). (3) Ring generation via intermolecular cyclization. (3.1) C7a-O and C3–C3a bond formation (route a + d). (3.2) O–C2 and C2–C3 bond formation: (route b + c). (3.3) O–C2 and C3–C3a bond formation: (route b + d). (4) Benzannulation. (5) Conclusion.
Publisher
MDPI AG,MDPI
Subject
Benzofurans - chemical synthesis
/ Biological Products - chemical synthesis
/ Biological Products - chemistry
/ Chemistry Techniques, Synthetic - history
/ Chemistry Techniques, Synthetic - methods
/ Chemistry, Pharmaceutical - history
/ Chemistry, Pharmaceutical - methods
/ Humans
/ Methods
/ Pharmaceutical Preparations - chemical synthesis
/ Pharmaceutical Preparations - chemistry
/ Phenols
/ Review
