Enantioselective Solid-Phase Peptide Synthesis Using Traceless Chiral Coupling Reagents and Racemic Amino Acids
作者:Beata Kolesinska、Katarzyna Kasperowicz-Frankowska、Justyna Fraczyk、Zbigniew J. Kaminski
DOI:10.1002/hlca.201200426
日期:2012.11
useful under typical conditions of solid‐phase peptide synthesis (SPPS) with enantiomerically homogeneous substrates. By SPPS, desired dipeptides were obtained in 84–94% yield using 4 equiv. of racemic Fmoc‐Ala, Fmoc‐Phe, and/or Fmoc‐Tyr for 1 equiv. of Wang resin loaded with Gly, Ala, Leu, Phe, Glu(tBu), and/or Pro, respectively. For all three Fmoc‐protected amino acids, the configuration of the enantiomer
对映选择性缩合试剂4,6-二甲氧基-1,3,5-三嗪(DMT)/司氏碱/ BF是通过用2-MT-4,6-二甲氧基-1,3,5-三嗪(CDMT)处理得到的士的宁四氟硼酸盐。该试剂在具有对映异构均质底物的固相肽合成(SPPS)的典型条件下很有用。通过SPPS,使用4当量可以以84–94%的产率获得所需的二肽。外消旋Fmoc-Ala,Fmoc-Phe和/或Fmoc-Tyr的含量为1当量。装有Gly,Ala,Leu,Phe,Glu的Wang树脂的含量(tBu)和/或Pro。对于所有三种Fmoc保护的氨基酸,在SPPS条件下优选的对映体构型与酰化组分的结构无关,并且与在溶液中进行缩合反应时所建立的构型相同。在所有情况下,对映体比率L / D(er)在相似的范围内,丙氨酸为9:92至2:98,芳族氨基酸为90:10至100:0。由外消旋的Fmoc-Ala合成Ac‐ L ‐ Lys (Ac)‐D ‐Ala‐