β-Phenylselenoalanine as a dehydroalanine precursor–efficient synthesis of alternariolide (AM-toxin I)
摘要:
Alternariolide (AM-toxin) is synthesized in 44% overall yield from L-2-amino-5-(4-methoxyphenyl)pentanoic acid; D-beta-phenylselenoalanine is used as the dehydroalanine precursor.
The cyclic depsipeptides, AM-toxins I and II and AM-toxin I analogs, were efficiently and rapidly prepared by the Fmoc-based solid-phase method for the synthesis of linear depsipeptides, with N-[(dimethylamino)-1H-1,2,3-triazolo[4,5-b]pyridin-1-ylmethylene]-N-methylmethanaminium hexafluorophosphate N-oxide (HATU) being used for their subsequent cyclization.