Background: Benzo[b]furan derivatives are oxygen-containing heterocyclic compounds consisting of
fused benzene and furan rings and are present in a large number of natural and non-natural compounds. This class
of compounds has a wide spectrum of biological activities, such as antiarrhythmic, anticancer, inflammatory, antioxidant,
antimicrobial, and antiviral. Furthermore, benzo[b]furan derivatives have also been applied in various
areas, such as organic electroluminescence device materials and organic dyes, photosensitizing material, organic
synthesis as building blocks or intermediates.
Because of a broad range of applicability, the synthesis of benzo[b]furan derivative has drawn great attention of
chemists and many studies on the synthesis of this class of compounds have been reported recently. This review
will give an overview of benzo[b]furan preparation based on studies dating back to the year 2012.
Objective: In this review, recent development in the synthesis of benzo[b]furans are discussed. There has been
increasingly new methodologies for the construction of benzo[b]furans skeleton to improve efficiency or develop
environmentally friendly procedures. In some studies, reaction mechanisms were also outlined.
Conclusion: Many methods for the synthesis of benzo[b]furans have been reported recently. Most of them involve
cyclization or cycloisomerization processes. Unquestionably, more imaginative strategies for the construction
of benzo[b]furan skeleton will be established in the near future. Application of known methods to natural
products or drug synthesis, on industrial scale for the synthesis of economically or medicinally important benzo[
b]furans will probably be paid attention to.