I. The Synthesis of Pyridine and Pyridine 1-Oxide Substituted Alanine Derivatives. II. Preliminary Investigations of Alpha-Chymotrypsin Catalyzed Hydrolyses of Acylated Amino Acid Esters at Low Enzyme Concentrations -- Studies of Surface Effects. Ill. The Synthesis and Rate of Acetolysis of 1-Bicyclo[2.2.11 Heptylmethyl Tosylate

Citation

Bixler, Robert L. (1957) I. The Synthesis of Pyridine and Pyridine 1-Oxide Substituted Alanine Derivatives. II. Preliminary Investigations of Alpha-Chymotrypsin Catalyzed Hydrolyses of Acylated Amino Acid Esters at Low Enzyme Concentrations -- Studies of Surface Effects. Ill. The Synthesis and Rate of Acetolysis of 1-Bicyclo[2.2.11 Heptylmethyl Tosylate. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/8PDN-2835. https://resolver.caltech.edu/CaltechETD:etd-07012004-100202

Abstract

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Methods for the preparation of pyridine and pyridine 1-oxide substituted alanines for use as substrates for the enzyme alpha-chymotrypsin were studied. As a consequence of this work, N-benzoyl-L-4-pyridylalanine 1-oxide methyl and ethyl esters, N-acetyl-DL-4-pyridylalanine 1-oxide methyl ester, and N-(nicotinyl 1-oxide)-L-phenylalanine methyl ester were prepared. The method for the synthesis of 4-pyridyl-alanine via a malonic ester condensation has been improved to the point where it is preparatively useful. It has been demonstrated that the catalytic reduction of pyridine 1-oxides in water with a platinum catalyst is nonspecific, the pyridine and pyridine 1-oxide groups being reduced at comparable rates. A kinetic study of the effect of surface on alpha-chymotrypsin catalyzed hydrolyses of acylated amino acid esters was carried out. It was shown that there was no effect of surface on the kinetics, varying the surface by a factor of 3000. However, it was shown that serious losses of enzyme can occur during transfer operations at an enzyme to surface ratio of [...] or greater. The possibility of avoiding these losses of enzyme during transfer by adding a "carrier" for the enzyme, in the form of colloidal silica, was investigated, and shown to have promise. It was shown that the enzyme was adsorbed on colloidal silica. Bicylo[2.2.1]hepty1methyl tosylate has been prepared, and its rate of acetolysis at 99[degrees]C. determined.

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