Studies on the Synthesis of Gymnodimine. Stereocontrolled Construction of the Tetrahydrofuran Subunit
作者:James D. White、Guoqiang Wang、Laura Quaranta
DOI:10.1021/ol030101c
日期:2003.10.1
yield a cis-2,5-disubstituted tetrahydrofuran, thus providing a powerful illustration of a stereodirecting effect first noted by Rychnovsky and Bartlett. The tetrahydrofuran was transformed into a subunit suitable for incorporation into the shellfish toxin gymnodimine.
Studies on the Synthesis of (−)-Gymnodimine. Subunit Synthesis and Coupling
作者:James D. White、Laura Quaranta、Guoqiang Wang
DOI:10.1021/jo062396o
日期:2007.3.1
portion of gymnodimine was synthesized via Diels−Alder cycloaddition of a 1,2,3-trisubstituted diene to a symmetrical dienophile obtained from Meldrum's acid. Differentiation of carbonyl groups in the cycloadduct was made by an intramolecular reaction with a neighboring alcohol to form a γ-lactone. Linkage of the two subunits at C18−C19 was accomplished by using a B-alkyl Suzuki coupling in which a borane