Perylenequinone Natural Products: Total Syntheses of the Diastereomers (+)-Phleichrome and (+)-Calphostin D by Assembly of Centrochiral and Axial Chiral Fragments
作者:Barbara J. Morgan、Carol A. Mulrooney、Erin M. O’Brien、Marisa C. Kozlowski
DOI:10.1021/jo901384h
日期:2010.1.1
utilize an enantiopure biaryl common intermediate, which is formed via an enantioselective catalytic biaryl coupling. The established axial chirality is transferred to the perylenequinone helical stereochemistry with good fidelity. Additionally, efforts focused on the installation of the stereogenic C7,C7′-2-hydroxypropyl groups. Three routes were evaluated to establish the C7,C7′-stereochemistry, in which
概述了 (+)-calphostin D 的第一次全合成和 (+)-phleichrome 的全合成。收敛合成利用对映纯的联芳基共同中间体,其通过对映选择性催化联芳基偶联形成。建立的轴向手性以良好的保真度转移到苝醌螺旋立体化学。此外,努力集中在立体 C7,C7'-2-羟丙基基团的安装上。评估了三种路线以建立 C7,C7'-立体化学,其中成功的路线涉及具有复杂轴向手性双铜酸盐的双环氧化物烷基化。
Dynamic Stereochemistry Transfer in a Transannular Aldol Reaction: Total Synthesis of Hypocrellin A
作者:Erin M. O'Brien、Barbara J. Morgan、Marisa C. Kozlowski
DOI:10.1002/anie.200800734
日期:2008.8.25
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.