Perylenequinone Natural Products: Enantioselective Synthesis of the Oxidized Pentacyclic Core
作者:Carol A. Mulrooney、Barbara J. Morgan、Xiaolin Li、Marisa C. Kozlowski
DOI:10.1021/jo9013832
日期:2010.1.1
An enantioselective approach to the perylenequinone core found in the mold perylenequinone natural products is outlined. Specifically, the first asymmetric syntheses of helical chiral perylenequinones absent any additional stereogenic centers are described. Key elements of the synthetic venture include a catalytic enantioselectivebiaryl coupling, a PIFA-induced naphthalene hydroxylation, and a palladium-mediated
Design, Synthesis, and Investigation of Protein Kinase C Inhibitors: Total Syntheses of (+)-Calphostin D, (+)-Phleichrome, Cercosporin, and New Photoactive Perylenequinones
作者:Barbara J. Morgan、Sangeeta Dey、Steven W. Johnson、Marisa C. Kozlowski
DOI:10.1021/ja902324j
日期:2009.7.8
The totalsyntheses of the PKC inhibitors (+)-calphostin D, (+)-phleichrome, cercosporin, and 10 novel perylenequinones are detailed. The highly convergent and flexible strategy developed employed an enantioselective oxidative biaryl coupling and a double cuprate epoxide opening, allowing the selective syntheses of all the possible stereoisomers in pure form. In addition, this strategy permitted rapid
Perylenequinone Natural Products: Evolution of the Total Synthesis of Cercosporin
作者:Barbara J. Morgan、Carol A. Mulrooney、Marisa C. Kozlowski
DOI:10.1021/jo9013854
日期:2010.1.1
The evolution of the First total synthesis of perylenequinone cercosporin is described. The key features developed during these efforts include a biscuprate epoxide alkylation, installation of the methylidene acetal, palladium-catalyzed O-arylation, and C3,C3'-decarbonylation. Due to the rapid atropisomerization of the helical axis of cercosporin (at 37 degrees C), the sequencing of these transformations was critical. To this end, the developed protocol enabled the formation of a key advanced intermediate oil preparative scale absent any atropisomerization. Furthermore, the O-arylation proved to be general, and the strategy was used in an improved synthesis of a helical chiral perylenequinone structure.