Photocatalytic Achmatowicz Rearrangement on Triphenylbenzene–Dimethoxyterephthaldehyde–Covalent Organic Framework-Mo for Converting Biomass-Derived Furfuryl Alcohol to Hydropyranone
Lejing Li, Lingling Wang, Guangri Jia, Liangpang Xu, Jiating Chen, Zhuofeng Hu, Jimmy C. Yu
Abstract
The conversion of biomass-based feedstocks into high-value platform compounds remains a fundamental but challenging topic. Studies on such transformations are sparse due to the complex nature of biomass and limited upgrading strategies. Photocatalytic aerobic oxidation is a promising pathway for making pharmaceutical precursors from biomass-derived chemicals. In this study, we demonstrate the transformation of furfuryl alcohol into dihydropyranone acetyl by using a molybdenum-incorporated triphenylbenzene–dimethoxyterephthaldehyde–covalent organic framework via a singlet oxygen ( 1 O 2 )-mediated photocatalytic Achmatowicz reaction. The COF-Mo photocatalyst exhibits exceptional selectivity up to 98% in producing hydroxy-2H-pyran-3(6H)-one, a complex synthone crucial for synthesizing anti-AIDS drugs. Mo incorporation enhances the generation rate by 3.9 times, primarily due to the synergistic effect between Mo active sites and the COF backbone. More importantly, Mo clusters create a superfast charge tunnel for photogenerated electron transfer from COF to adsorbed O 2 . The metallic state and hexavalent of Mo facilitate the generation of superoxide anions and 1 O 2, respectively, facilitating photocatalytic reactions.