http://http://dspace.unitus.it:80 The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material. Sat, 25 May 2013 21:47:09 GMT 2013-05-25T21:47:09Z http://hdl.handle.net/2067/1341 Title: Methyltrioxorhenium catalysed synthesis of highly oxidised aryltetralin lignans with anti-topoisomerase II and apoptogenic activities Authors: Fiani, Cinzia; Belfiore, Maria Cristina; Gualandi, Giampiero; Penna, Sabrina; Mosesso, Pasquale Abstract: A novel and efficient procedure to prepare highly oxidised aryltetralin lignans, such as isopodophyllotoxone and (-)-aristologone derivatives, by oxidation of podophyllotoxin and galbulin with methylrhenium trioxide (MTO) and novel MTO heterogeneous catalysts is reported. It is noteworthy that in the case of isopodophyllotoxone derivatives the functionalisation of the C-4 position of the C-ring and the ring-opening of the D-lactone moiety increased the activity against topoisomerase II while causing the undesired inhibition of tubulin polymerisation to disappear. The novel (-)-aristologone derivatives showed apoptogenic activity against resistant human lymphoma cell lines. Description: L'articolo è disponibile sul sito dell'editore: http://www.sciencedirect.com Fri, 31 Dec 2004 23:00:00 GMT http://hdl.handle.net/2067/1341 2004-12-31T23:00:00Z