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Tags: Organic Seminar

Since approval by the FDA in 1989, erythropoietin (EPO) has been used extensively for the treatment of anemia – especially in those with chronic kidney disease, undergoing chemotherapy, or have acquired immune deficiency syndrome (AIDS).1 EPO is a highly glycosylated glycoprotein containing three N-linked and one O-linked glycosylation sites. These glycans constitute 40% of the weight of the glycoprotein and are important for activity.2 It has…
My research group is interested in mechanistic insights to sort out the reactive oxygen intermediates in photooxidation reactions. We have made contributions to the fields of photooxidation and oxygen-transfer processes, including singlet-oxygen disinfection priming and selective oxidations. In this seminar, one topic to be discussed is the shrinking of a molecular gap (so-to-speak), that is improving of mechanistic understanding of a…
Fischer carbene complexes with six valence electrons, characterized by a singlet carbene center, demonstrate an amphiphilic nature.1 The transition metal carbene complexes share similarities with Fischer carbene complexes, potentially functioning as both nucleophiles and electrophiles.2 This duality enables chemists to accomplish intricate transformations, such as C-H bond insertion or cyclopropanation. Despite their utility, the synthetic…
The concept of click chemistry was first introduced by Sharpless and his coworkers in 20011 , with the copper-mediated azide-alkyne cycloaddition (CuAAC) being the first click reaction to be introduced. Although a robust and precise reaction, ligating azides with terminal alkynes to afford 1,4-disubstituted triazoles, CuAAC was inherently limited due to its utilization of toxic copper metal as well as its limiting requirement for pre-…
Current batch enzymatic processes to important semi-synthetic beta-lactam antibiotics, such as amoxicillin and cephalexin, suffer from yield and selectivity limitations, owing to primary and secondary hydrolysis side reactions (see Figure). Through continuous flow and reactive crystallization of the beta-lactam product, we sought to suppress primary hydrolysis and prevent secondary hydrolysis. Indeed, we found higher yields than in homogenous…

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