作者:Bowen Gao、Sigui Chen、Yun Nan Hou、Yong Juan Zhao、Tao Ye、Zhengshuang Xu
DOI:10.1039/c8ob02803f
日期:——
The first solution-phase total synthesis of the cyclic depsipeptide teixobactin is described. Stereoselective construction of L-allo-enduracididine was established, and the protectivegroups for the peptide coupling reactions and conditions for the assembly of the fragments were also optimised. The longest linear sequence for the total synthesis was 20 steps from the known L-cis-4-hydroxyproline derivative
Trading N and O. Part 4: Asymmetric synthesis of syn-β-substituted-α-amino acids
作者:Stephen G. Davies、Ai M. Fletcher、Catherine J. Greenaway、Matthew S. Kennedy、Christoph Mayer、Paul M. Roberts、James E. Thomson
DOI:10.1016/j.tet.2018.04.071
日期:2018.9
C(2)-position. Subsequent activation of the α-hydroxy moiety as a leaving group followed by displacement by the β-amino substituent gave the corresponding aziridinium species. Regioselective in situ ring-opening of the aziridiniumintermediates with either water or fluoride gave the corresponding syn-β-hydroxy-α-amino ester or syn-β-fluoro-α-amino ester, respectively, and N-deprotection and ester hydrolysis