Ten derivatives (3-12) of marine alkaloid lamellarin D (1) were synthesized and evaluated for cytotoxicity against a HeLa cell line in an effort to examine their structure-activity relationships. It appeared that the hydroxyl groups at positions C-8 and C-20 of 1 were important structural requirements for cytotoxic activity, while the hydroxyl group at C-14 and the two methoxy groups at C-13 and C-21 were not necessary for the activity.
A High-Yielding Modular Access to the Lamellarins: Synthesis of Lamellarin G Trimethyl Ether, Lamellarin η and Dihydrolamellarin η
作者:Dennis Imbri、Johannes Tauber、Till Opatz
DOI:10.1002/chem.201303563
日期:2013.11.4
A deprotonated α‐aminonitrile serves as a key intermediate in a highly efficient (95 % per step on average; see scheme) modular synthetic approach to the lamellarin alkaloids. Its reaction with an α,β‐unsaturated aldehyde forms the central pyrrole ring in a one‐pot procedure. The construction of the fused pentacyclic skeleton is completed by a microwave‐assisted Ullmann‐type lactone formation.