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Creator:: Dantanarayana, Anura Pathmasiri
Abstract:: Avermectins are a group of potent anthelmintic agents produced by Streptomyces avermitilis. They are active at extremely low dosages and are now in commercial use. In this study, the synthesis of two segments of avermectin B[subscript 1a] are described. The synthesis of the hexahydrobenzofuran subunit (segment A) began with the...
Resource Type:: Dissertation
Full Text:: silyl protecting group of 79 afforded the acid-lactone 81 which was resolved using (R)-(+)-a

Creator:: Drapela, Nicholas Ernest
Abstract:: An asymmetric approach to the synthesis of byssochlamic acid (1) is described. Regioisomeric enzymatic differentiation is described in the selective hydrolysis of dimethyl ester 30 by porcine liver esterase. Chiral dimethyl ester 42 was prepared by desymmetrization of cyclopentene 34 using porcine liver esterase. A key intramolecular [2+2]cycloaddition-cycloreversion photometathesis of...
Resource Type:: Dissertation
Full Text:: Acid 5: Heveadride 3: Glaucanic Acid 6: Castaneiolide O 7a: Rubratoxin A (R = H, OH) 7b

Creator:: Lee, Nadine Chauyi
Resource Type:: Dissertation
Full Text:: the monoterpene (R)-(+)-citronellal (102). The synthesis proved that the original stereochemical

Creator:: Kim, Jungchul
Abstract:: PART I. Asymmetric syntheses of both natural (+)- and nonnatural (-)-byssochlamic acid via a [2+2] photoaddition-cycloreversion strategy are described. X-ray crystallographic analysis of the cyclohexylamine salt 99 showed that the structure of the monomethyl ester 100 from esterase hydrolysis of 44 was originally misassigned as 56. The enantiomeric relationship of...
Resource Type:: Dissertation
Full Text:: . Robarge, Joshua D. Hansen, Kurt F. Sundermann, Sundaram M. Shanmugham, Christopher M. Lincoln, Punlop

ScholarsArchive@OSU