Synthesis and biological evaluation of a potent salicylihalamide A lactam analogue
作者:Dan Balan、Christopher J. Burns、Nicholas G. Fisk、Helmut Hügel、David C. S. Huang、David Segal、Charlotte White、Jörg Wagler、Mark A. Rizzacasa
DOI:10.1039/c2ob26649k
日期:——
The first synthesis of a lactam analogue 3 of salicylihalamide A (1) is reported. A key step in the approach was a photochemical acylation coupling between amine 10 and dioxinone 9 to form the amide 19. Acetylation followed by RCM with Grubbs 1st generation catalyst gave the desired E-lactam 23 (E : Z ratio 87 : 13) as the major compound. Conversion of macrolactam 23 into the vinyl iodide 26 followed by Cu catalysed cross coupling with the diene amide 7 gave aza-salicylihalamide analogue 3 in good yield. This compound demonstrated potent activity against several human leukaemia cell lines.