电压依赖性膜成孔多肽抗生素alamethicin F 30(Ac-Aib-Pro-Aib-Ala-Aib-Ala-Gln-Aib-Val-Aib-Gly-Leu-Aib-Pro-Val-Aib-Aib- Glu-Gln-Phl,1)是通过链段缩合合成的。使用二环己基碳二亚胺/ 1-羟基苯并三唑和混合酸酐法,可通过链段2-11(4a)和12-20(3a)获得不含外消旋物(<0.8%D组分)的化合物。通过色谱和物理方法(包括13 C NMR,圆二色性和手性气相色谱法)明确表征了中间体。段2–6(5a)和12–20(3)也通过X射线结构确定得到了证明。—在不进行HPLC分离的情况下,获得了非常高的纯度和结晶形式的最终产物1(150 mg)。根据所有分析数据以及通过光谱法和色谱分析法(HPLC,DC)进行的比较,产物1与从木霉属木霉分离的微异质抗生素代谢产物的主要成分F 30相同。合成的alame
Efficient coupling of α,α-dimethyl amino acid using a new chloro imidazolidium reagent, CIP
作者:Kenichi Akaji、Naohiro Kuriyama、Yoshiaki Kiso
DOI:10.1016/s0040-4039(00)76895-x
日期:1994.5
CIP (2-chloro- 1,3-dimethylimidazolidium hexafluorophosphate) was an efficient coupling agent for Nα-protected a-aminoisobutyric acid (Aib) in the presence of an additive. The reactivity was enhanced markedly by a catalytic amount of additive in the order of HOAt∼HODhbt > DMAP> HOBt. These couplings occurred without detectable racemization.
Bis(4,6-dimethoxy-1,3,5-triazin-2-yl) Ether as Coupling Reagent for Peptide Synthesis
作者:Konrad Jastrzabek、Przemyslaw Bednarek、Beata Kolesinska、Zbigniew J. Kaminski
DOI:10.1002/cbdv.201200369
日期:2013.5
4‐diazabicyclo[2.2.2]octane (DABCO) to yield, under mild reaction conditions, superactive triazine esters. Versatility of this new couplingreagent was confirmed by condensation of lipophilic and sterically hindered carboxylic acids with amines in 71–98% yield, and by synthesis of peptides, including those containing Aib‐Aib sequence, in solution with high yield and high enantiomeric purity.
作者:Fernando Albericio、Miguel A Bailén、Rafael Chinchilla、David J Dodsworth、Carmen Nájera
DOI:10.1016/s0040-4020(01)00985-1
日期:2001.11
3-tetramethylurea (TMU) or 1,3-dimethylpropyleneurea (DMPU), have been employed as reagents in solution and solid-phase peptidecoupling chemistry. Furthermore, 2-mercaptopyridine-1-oxide has been employed as racemization-reducing additive combined with the new thiouronium salts and other frequently used peptidecouplingreagents such as DCC or TBTU.
Synthesis of Peptides Employing Protected-Amino Acid Halides Mediated by Commercial Anion Exchange Resin
作者:K. M. Bhaskara Redddy、Y. Bharathi Kumari、Kuppanna Ananda
DOI:10.1007/s10989-012-9337-5
日期:2013.9
AbstractCoupling of protected-amino acid halides (chloride, fluoride) mediated by commercial anion exchange resin for the solution phase synthesis of peptides is described. The reaction was carried out in an organic medium, circumventing the use of an organic base or an inorganic base. The coupling is fast, clean and racemization free. The anion exchange resin functions as a solid-phase basic scavenger