Enantioselective Total Synthesis of (+)-Lithospermic Acid
摘要:
An enantioselective synthesis of (+)-lithospermic acid, a potent anti-HIV agent, has been accomplished in a convergent manner in nine steps. The synthesis features an enantioselective intramolecular oxa-Michael addition catalyzed by a quinidine derivative, a hypervalent iodine-mediated rearrangement of chromanone to dihydrobenzofuran, an enantioselective alpha-oxyamination, and an intermolecular C-H olefination.
Enantioselective Total Synthesis of (+)-Lithospermic Acid
摘要:
An enantioselective synthesis of (+)-lithospermic acid, a potent anti-HIV agent, has been accomplished in a convergent manner in nine steps. The synthesis features an enantioselective intramolecular oxa-Michael addition catalyzed by a quinidine derivative, a hypervalent iodine-mediated rearrangement of chromanone to dihydrobenzofuran, an enantioselective alpha-oxyamination, and an intermolecular C-H olefination.
Total synthesis of lithospermic acid using Fe-catalyzed Cross-Dehydrogenative-Coupling reaction and Pd-catalyzed ester-directed C H olefination
作者:Yong Zheng、Weibin Song、Yefu Zhu、Bole Wei、Lijiang Xuan
DOI:10.1016/j.tet.2018.08.028
日期:2018.10
The total synthesis of lithospermic acid has been accomplished employing two CH activation reactions as key steps. Fe-catalyzed Cross-Dehydrogenative-Coupling reaction was used for the rapid construction of benzofuran framework. Pd-catalyzed ester-directed CH olefination allowed the efficient assembly of the dihydrobenzofuran ester and acrylate moieties.