Date of Award

Fall 1981

Document Type


Degree Name

Master of Science (MS)


Chemistry & Biochemistry



Committee Director

Frank E. Scully, Jr.

Committee Member

Charles E. Bell

Committee Member

Donald Oglesby

Committee Member

Roscoe Carter

Committee Member

Roy L. Williams

Call Number for Print

Special Collections LD4331.C45 S37


Dihydroisoquinolines and tetrahydroisoquinolines are compounds which possess a variety of pharmacological activities. New easier methods of synthetic manipulations of these structures is of constant interest in the pharmaceutical industry.

This paper describes a new three step method of preparing 1-alkyl- and 1-aryl-tetrahydroisoquinolines from a tetrahydroisoquinoline. The synthesis involves the N-chlorination of tetrahydroisoquinoline followed by dehydrohalogenation with potassium superoxide. The reaction products are the dihydroisoquinolines. Overall yields range from 85-96%. The unsubstituted, 1-methyl-, and 1-phenyl-J,4-dihydroisoquinolines have been formed. Organometallation of the unsubstituted dihydroisoquinoline provides the 1-substituted tetrahydroisoquinoline. The 1-benzyl-, 1-n-butyl-, 1-ethyl-, 1-methyl-, and 1-phenyl-1,2,J,4-tetrahydroisoquinolines were prepared. The use of Grignard and organolithium reagents is compared. The reaction conditions in all steps are mild and can be performed in one pot with an ether solvent.


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