A new stereoselective route to (2S, 3S, 8S, 9S, 4E, 6E)-3-amino-9-methoxy-2, 6, 8-trimethyl-10-phenyldeca-4, 6-dienoic acid (Adda)
作者:Hong Yong Kim、Peter L. Toogood
DOI:10.1016/0040-4039(96)00282-1
日期:1996.4
N-Boc-Adda has been prepared in 15 steps and 9% overall yield from the readily available alcohol, 3-pentyne-2-ol, employing a route that includes two Claisen rearrangements.
A general route is described for the preparation of microcystins and nodularins, including new chemistry for the preparation of β-methyl-D-aspartic acid.
文中描述了一般制备微囊藻毒素和节球藻毒素的路线,包括制备β-甲基-D-天冬氨酸的新化学方法。
Total Synthesis of Motuporin and 5-[<scp>l</scp>-Ala]-Motuporin
作者:Raghu Samy、Hong Yong Kim、Matthew Brady、Peter L. Toogood
DOI:10.1021/jo982145i
日期:1999.4.1
Total synthesis of the cyclic peptide hepatotoxin motuporin is described, including an efficient synthesis of the constituent amino acid Adda. Three strategies to motuporin are outlined with their relative strengths and weaknesses. Cyclization of the linear peptide precursor was found to proceed moderately well for peptides containing the N-methyldehydrobutyrine residue masked as a threonine, but significant C-terminal epimerization occurred in the presence of the dehydroamino acid. Replacement of the N-methyldehydrobutyrine residue by L-alanine was explored to assess the contribution of this dehydroamino acid to the biochemical activity of motuporin. Some epimerization also was observed during cyclization of the alanine-containing peptide. Synthetic motuporin and both isomers of 5-[L-Ala]-motuporin inhibit the activity of protein phosphatase-l (PP1) in rat adipocyte lysates with comparable IC50 values. These results indicate that the N-methyldehydrobutyrine residue is not essential for PP1 inhibition.