Cis−Trans Proline Isomerization Effects on Collagen Triple-Helix Stability Are Limited
作者:Nan Dai、Felicia A. Etzkorn
DOI:10.1021/ja904177k
日期:2009.9.30
alkene isostere peptide that did not involve cis-trans Pro isomerization (Jenkins, C. L.; Vasbinder, M. M.; Miller, S. J.; Raines, R. T. Org. Lett. 2005, 7, 2619-22). Thus, single cis-trans proline amide isomerization alone has limited contribution to the overall stability of the collagentriplehelix. Since collagen has a high content of imino acid residues, the cumulative effects of cis-trans isomerization
Synthesis of Two Dipeptide Isosteres Containing Di- and Trisubstituted <i>E</i>-Configured Double Bonds
作者:Ulrich Koert、Nina Bandur、Klaus Harms
DOI:10.1055/s-2007-983783
日期:2007.9
stereoselective syntheses of a Tyr-Tyr and a Pro-Pro E-alkene isostere are described. While the Tyr-Tyr isostere was synthesized following a convergent olefination strategy, the trisubstituted E-configured double bond of the Pro-Pro isostere was generated by an Ireland-Claisen rearrangement. The configuration of all key intermediates containing new stereocenters was determined by X-ray crystallography
描述了 Tyr-Tyr 和 Pro-Pro E-烯烃等排体的立体选择性合成。虽然 Tyr-Tyr 等排体是按照会聚烯化策略合成的,但 Pro-Pro 等排体的三取代 E 构型双键是通过 Ireland-Claisen 重排产生的。包含新立体中心的所有关键中间体的构型由 X 射线晶体学确定。
First Stereoselective Synthesis of a Pro-Pro<i>E</i>-Alkene Dipeptide Isostere
作者:Ulrich Koert、Nina G. Bandur、Klaus Harms
DOI:10.1055/s-2005-863731
日期:——
A stereoselective synthesis of a proline-proline E-alkeneisostere is described. Starting from N-Boc-L-proline the new stereocenter is generated by diastereoselective alkenylation and subsequent Ireland-Claisen rearrangement. The relative configuration of the double bond and the new generated stereocenter were determined by X-ray crystallography.
描述了脯氨酸-脯氨酸 E-烯烃等排体的立体选择性合成。从 N-Boc-L-脯氨酸开始,新的立体中心是通过非对映选择性烯基化和随后的爱尔兰-克莱森重排产生的。双键的相对构型和新生成的立体中心由 X 射线晶体学确定。