Synthesis of Unsymmetrical 1,4-Dicarbonyl Compounds by Photocatalytic Oxidative Radical Additions
作者:Ya Dong、Ruining Li、Junliang Zhou、Zhankui Sun
DOI:10.1021/acs.orglett.1c02208
日期:2021.8.20
Herein we report a photocatalytic oxidative radical addition reaction for the synthesis of unsymmetrical 1,4-dicarbonyl compounds. This reaction utilizes a desulfurization process to generate electrophilic radicals, which add to α-halogenated alkenes and undergo further oxidation to deliver 1,4-dicarbonyl compounds. This mild and highly efficient method provides a valuable alternative to known strategies
Exploration and Optimization of an Efficient One-pot Sequential Synthesis of Di/tri-substituted Thiazoles from α-Bromoketones, Thioacids Salt, and Ammonium Acetate
作者:Eeda Venkateswararao、Hitesh B. Jalani、Manickam Manoj、Sang-Hun Jung
DOI:10.1002/jhet.2446
日期:2016.9
Exploration of scope of an optimized one‐pot sequential procedure for preparing of 2,4‐di‐ and 2,4,5‐tri‐substituted thiazoles has been accomplished. The synthesis was performed by the initial formation of a β‐keto‐thioester intermediate from nucleophilic substitution of α‐bromoketones with thioacid potassium salts, followed by treatment with ammoniumacetate and one equivalent of acetic acid in toluene
class I/II enzymes is a new, promising approach for cancer therapy. In the present study, we disclose a new structural class of HDAC inhibitors with the trithiocarbonate motif. A clear structure-activity-relationship was obtained for the cap-linker motif and the putative Zn(2+) complexing head group. Selected analogs display potent inhibition of HDAC enzymatic activity and a cellularpotency comparable
Green Synthesis of α-Keton Thiol Ester via Photocatalytic Oxidative Radical Addition of Thioic Acid to Alkene
作者:Xiyan Zhou、Ruining Li、Zhankui Sun
DOI:10.1021/acs.orglett.3c01481
日期:2023.6.9
α-Keton sulfides are versatile building blocks in organic synthesis. From thioic acids and alkenes, we were able to develop the direct synthesis of α-keton thiolesters via photocatalytic oxidative radical additions. This reaction well matches the idea of green chemistry. It takes the advantage of thioxanthone as an inexpensive organic photocatalyst, O2 as a green oxidant, EtOAc as a green solvent
Here, we report the organocatalytic enantioselective synthesis of dihydrothiopyran derivatives from trans racemic donor-acceptor cyclopropane carbaldehydes (DACCs) and 2-mercapto-1-arylethanone via formal thio (4+2) cycloaddition involving thia-Michael aldol condensation and annulation. Mechanistic studies indicate a typical kinetic resolution (KR) is involved in this transformation, which results