The current interest in biomass derived renewable furan derivatives furfural and 5-hydroxymethylfurfural commonly known as biofurans is due to their ready accessibility through dehydration of abundant cellulosic biomass derived monosaccharides. However, an upgrading to more stable compounds is an essential step for these materials in many sustainable fuel and chemical industry applications due to their instability and facile polymerization to humins. The aim of this article is to cover all aspects of catalytic upgrading reactions of biofurans, especially focusing on the developments in the last five years. The importance of this class of renewable feedstocks, preparation from monosaccharides as well as the diversity of possible transformations are discussed in the introduction sections of this review. The recent advances in catalytic reductions and oxidations of biofurans at CHO, OH functional groups, in ring system as well as rearrangements to form more stable value-added derivatives are reviewed. In addition, recently developed catalytic methods in carbon number upgrading of biofurans through condensation reactions and further conversions to renewable synthetic fuel range molecules are discussed in the article.

目前对生物质衍生的可再生呋喃衍生物糠醛和5-羟甲基糠醛（通常称为生物呋喃）的兴趣是由于它们通过大量纤维素生物质衍生的单糖脱水而易于获得的。但是，由于这些材料的不稳定性和易于合成的腐殖质，因此在许多可持续的燃料和化学工业应用中，将这些化合物升级为更稳定的化合物是必不可少的步骤。本文的目的是涵盖生物呋喃催化升级反应的所有方面，特别是关注最近五年的发展。这类可再生原料的重要性，由单糖制备以及可能的转化的多样性在本综述的介绍部分中进行了讨论。综述了环系统中CHO，OH官能团上的生物呋喃催化还原和氧化的最新进展以及形成更稳定的增值衍生物的重排。此外，本文还讨论了最近开发的通过缩合反应提高生物呋喃碳数以及进一步转化为可再生合成燃料范围分子的催化方法。