Synthesis of Methyl N-Boc-(2S,4R)-4-methylpipecolate
摘要:
An efficient stereoselective synthesis of fully protected (2S,4R)-4-methylpipecolic acid has been developed. The synthesis was achieved by initial asymmetric a-alkylation of glycine with a chiral iodide, affording the linear precursor as a single stereoisomer. Subsequent aldehyde formation using OsO4/NaIO4 followed by immediate intramolecular cyclization afforded an enamine that was then subjected to hydrogenation to give the final compound in 23% yield over 10 steps.
Synthesis of Methyl <i>N</i>-Boc-(2<i>S</i>,4<i>R</i>)-4-methylpipecolate
作者:Kuo-yuan Hung、Paul W. R. Harris、Margaret A. Brimble
DOI:10.1021/jo102038q
日期:2010.12.17
An efficient stereoselective synthesis of fully protected (2S,4R)-4-methylpipecolic acid has been developed. The synthesis was achieved by initial asymmetric a-alkylation of glycine with a chiral iodide, affording the linear precursor as a single stereoisomer. Subsequent aldehyde formation using OsO4/NaIO4 followed by immediate intramolecular cyclization afforded an enamine that was then subjected to hydrogenation to give the final compound in 23% yield over 10 steps.
Synthesis of the Peptaibol Framework of the Anticancer Agent Culicinin D: Stereochemical Assignment of the AHMOD Moiety
作者:Kuo-yuan Hung、Paul W. R. Harris、Margaret A. Brimble
DOI:10.1021/ol302852q
日期:2012.11.16
The postulated structure of the potent anticancer peptaibol culicininD has been synthesized using Fmoc-based solid-phase peptide synthesis (SPPS). Comparison of the 1H NMR data for the reported structure of culicininD with the data obtained for the two synthetic polypeptides epimeric at C-6 in the AHMOD unit established the C-6 stereochemistry of the AHMOD residue in the natural product to be (R)
使用基于Fmoc的固相肽合成(SPPS)合成了有效的抗癌肽肽culicinin D的假定结构。所报告的culicinin D结构的1 H NMR数据与在AHMOD单元中C-6处的两个合成多肽融合的合成数据的比较确定了天然产物AHMOD残基的C-6立体化学为(R)。