A Total Synthesis of Nannochelin A. A Short Route to Optically Active <i>N</i><sup>ω</sup>-Hydroxy-α-amino Acid Derivatives
作者:Takeshi Sakamoto、Hao Li、Yasuo Kikugawa
DOI:10.1021/jo961458f
日期:1996.1.1
The total synthesis of nannochelin A, a lysine-basd cinnamoyl hydroxamate produced by Nannocystis exedens, is described. The key transformation involves construction of the N-epsilon-cinnamoyl-N-epsilon-hydroxy-L-lysine methyl ester fragment by partial reduction of the lactam carbonyl of 6 derived from L-lysine, oximation of this aldehyde equivalent compound 8 with O-[2-(trimethylsilyl)ethyl]hydroxylamine, and reduction of the oxime 10, followed by N-acylation prior to coupling with the external carbonyls of citric acid. This methodology will be applicable to synthesis of other hydroxamate-containing siderophores bearing hydrogenolyzable groups in the molecule.