Synthesis of Thelepamide via Catalyst-Controlled 1,4-Addition of Cysteine Derivatives and Structure Revision of Thelepamide
作者:Tobias Seitz、Ramón E. Millán、Dieter Lentz、Carlos Jiménez、Jaime Rodríguez、Mathias Christmann
DOI:10.1021/acs.orglett.7b03706
日期:2018.2.2
The first enantioselective total synthesis and structural reassignment of (−)-thelepamide, a cytotoxic tetraketide–amino acid from the marine worm Thelepus crispus, is reported. A convergent approach provides access to all thelepamide diastereomers in six steps from four simple building blocks. Key features of the synthesis include the application of Melchiorre’s organocatalytic thia-Michael reaction
据报道,首次从海洋蠕虫Thelepus crispus获得了具有细胞毒性的四酮化合物-氨基酸-(-)-thelepamide的对映选择性全合成和结构重新分配。收敛方法可从四个简单的构建基元中以六个步骤访问所有的lepamide非对映异构体。合成的关键特征包括应用Melchiorre的有机催化thia-Michael反应和超声辅助的N,O-乙缩醛-半缩醛部分的组装。通过NMR-DFT分析确认了校正后的结构。