A novel three-step hydroxy-deamination sequence: Conversion of lysine to 6-hydroxynorleucine derivatives
作者:C.Richard Nevill、Paul T. Angell
DOI:10.1016/s0040-4039(98)01142-3
日期:1998.8
Oxidation of carbamates with catalytic RuO4, generated from RuO4, and NaBrO3, provides the corresponding acyl carbamates, which can be reduced with NaBH4 to provide alcohols. Application of this methodology to L-lysine provides (S)-6-hydroxynorleucine derivatives. (C) 1998 Elsevier Science Ltd. All rights reserved.
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.
A selective catalytic side chain oxidation of lysine and ornithine derivatives
The fully protected derivatives of the diamino acids lysine and ornithine (n=1, 2) can be oxidized selectively in the sidechain using a Mn(OAc)2/peracetic acid/NaOAc system. The ε or γ carbon, respectively, is converted to the aldehyde oxidation state, protected as the cyclic N,N-acetal.