subjected 65 templates and synthesized by dicyclohexyl carbodiimide coupling using polystyrene as solid support. All the synthesized compounds were purified by column chromatography and further confirmed by melting point, infrared, proton nuclear magneticresonance and mass spectral datas. Acute toxicity studies were performed for dose selection in all the compounds using OECD guidelines 423 (Annexure
本研究描述了一种合成较小链三肽和四肽并在小鼠中测试其抗伤害感受力的方法。基于疏水性比率和总净电荷作为描述符的合理药物设计,选择了五个潜在客户,即Met-Arg-Tyr(MRY),Met-Val-Tyr(MVY),Met-Ile-Cys-Tyr(MICY ),Met-Trp-Lys-Tyr(MWKY)和Phe-Trp-Lys-Tyr(FWKY)分别来自65个模板,并以聚苯乙烯为固体载体通过二环己基碳二亚胺偶联合成。所有合成的化合物均通过柱色谱法纯化,并通过熔点,红外,质子核磁共振和质谱数据进一步证实。使用OECD指南423(附件2b)对所有化合物进行急性毒性研究,以选择剂量。在瑞士的白化病小鼠中使用乙酸扭体法和热板法测试了肽的抗伤害感受力。LD三肽(MRY,MVY)和四肽(Met-Ile-Cys-Tyr,Met-Trp-Lys-Tyr,Phe-Trp-Lys-Tyr)的50截断mg / kg
Deprotection of the Indole (Nind)-Formyl (For) Group on Tryptophan Employing a New Reagent, N,N'-Dimethylethylendiamine (DMEDA) in an Aqueous Solution
The deprotection of the indole (N(ind))-formyl (For) group on Trp was achieved in a 95% yield using N,N'-dimethylethylendiamine (DMEDA) (1.5, 2.0, 3.0 eq) in water at room temperature. A new reagent was successfully applied to the deprotection of a model peptide, H-Phe-Trp(N(ind)-For)-Lys-Tyr-OH, to give H-Phe-Trp-Lys-Tyr-OH in a 91% yield.