The First Total Synthesis of (–)-Lemonomycin and Progress toward the Total Synthesis of (+)-Cyanocycline A

Author: Ashley, Eric Robert

Year: 2006

Degree: Dissertation (Ph.D.)

Advisor: Stoltz, Brian M.

Committee Members: Grubbs, Robert H.; Stoltz, Brian M.; MacMillan, David W. C.; Gray, Harry B.

Option: Chemistry

DOI: 10.7907/QM4S-3B86

Abstract

The first total synthesis of (–)-lemonomycin has been accomplished. The synthesis features a novel, auxiliary-controlled asymmetric dipolar cycloaddition, a highly convergent Suzuki coupling, a diastereoselective enamide hydrogenation to set the C(3) stereochemistry, and a convergent, efficient, and completely diastereoselective Pictet-Spengler cyclization with a glycosyloxy acetaldehyde.

The total synthesis of (+)-cyanocycline A has been approached along two routes. Both routes feature dipolar cycloaddition reactions with alkyne-containing substrates and completely diastereoselective hydrogenations to set the C(4) stereochemistry. Proposals for the advancement of late-stage intermediates to the natural product are included.

Files