Synthesis of N -benzyl-des- D -ring lamellarin K via an acyl-Claisen/Paal-Knorr approach
作者:Nora Dittrich、Lisa I. Pilkington、Euphemia Leung、David Barker
DOI:10.1016/j.tet.2017.02.044
日期:2017.4
Lamellarin K is a complex pyrrole natural product and member of the lamellarin family - a group of natural products known for their potent biological activities, such as, antiproliferative activity and inhibition of P-gp mediated drug efflux pumps. We herein describe the synthesis of the N-benzyl-des-D ring analogue of lamellarin K using a route that centres on an acyl-Claisen reaction to eventually prepare a highly-functionalised 1-aryl-4-methyl-1,4-diketone. Paal-Knorr pyrrole formation using this diketone undergoes auto-oxidation to give a fully-substituted 5-formyl pyrrole which was converted into the natural lactone B ring. Antiproliferative testing of the N-benzyl-des-D ring analogue gave an IC50 of 2.63 mu M against the MDA-MB-231 breast cancer cell line. (C) 2017 Elsevier Ltd. All rights reserved.