An Improved Manufacturing Process for the Antimalaria Drug Coartem. Part II
作者:Ulrich Beutler、Peter C. Fuenfschilling、Andreas Steinkemper
DOI:10.1021/op060244p
日期:2007.5.1
The manufacturing process for lumefantrine, 2, one of the two active principles in the fixed-dose combination of the antimalarial drug Coartem, was reworked. For the conversion of 2-chloro-1-(2,7-dichloro-9H-fluoren-4-yl)ethanone, 5, to 2-dibutylamino-1-(2,7-dichloro-9H-fluoren-4-yl)ethanol, 8, a one-pot process was developed that eliminated isolation of the epoxide 2-(2,7-dichloro-9H-fluoren-4-yl)oxirane, 7. Significant increase in throughput was achieved by applying new reaction and crystallization conditions for the Knoevenagel condensation of 2-dibutylamino-1-(2,7-dichloro-9H-fluoren-4-yl)ethanol, 8, to 2-dibutylamino-1-2,7-dichloro-9-[1-(4-chlorophenyl)meth-(Z)-ylidene]-9H-fluoren-4-yl}ethanol, 2.