Nonproteinogenic amino acids: an efficient asymmetric synthesis of (S)-(−)-acromelobic acid and (S)-(−)-acromelobinic acid
作者:Maciej Adamczyk、Srinivasa Rao Akireddy、Rajarathnam E Reddy
DOI:10.1016/s0040-4020(02)00670-1
日期:2002.8
efficient synthesis of (S)-(−)-acromelobic acid (1) and (S)-(−)-acromelobinic acid (2) is described via asymmetric hydrogenation protocol. Asymmetric hydrogenation of dehydroamino acid derivative 23 using (R,R)-[Rh(DIPAMP)(COD)]BF4 catalyst followed by removal of the protective groups afforded (S)-(−)-acromelobic acid (1) in >98% ee. The key intermediate 23 was prepared from citrazinic acid (8). The dehydroamino
New amino acids from clitocybe acromelalga. Possible intermediates in the biogenesis of mushroom toxins, acromelic acids
作者:Kimiaki Yamano、Haruhisa Shirahama
DOI:10.1016/s0040-4020(01)86321-3
日期:1993.3
New aminoacids, 3-(6-carboxy-2-oxo-3-pyridyl)-L-alanine, 3-(6-carboxy-2-oxo-4-pyridyl)-L-alanine and N-[2-(3-pyridyl)ethyl]-L-glutamic acid were isolated from the poisonous mushroom and their structures were determined. Their occurrence in this fungus supports the previously proposed biogenesis of acromelic acids.