Two efficient procedures involving tin hydride or thiophenol-mediated intramolecular homolytic substitution at the sulfur atom are reported. They lead to the generation of varied P(V)-centered radicals from the corresponding aryl or alkyne thiophosphorus substrates. The radical formed can be trapped by an olefin via an intermolecular addition, leading to the construction of C–P bonds. Thiophosphination
Design and synthesis of chromogenic thiopeptolide substrates as MetAPs active site probes
作者:Yong-Mei Cui、Jing-Ya Li、Ling-Ling Chen、Jia Li、Qi-Zhuang Ye、Fa-Jun Nan
DOI:10.1016/j.bmc.2004.03.044
日期:2004.6
Twenty one chromogenic thiopeptolide substrates were designed and synthesized as the active site probes and analyzed with each S1 site of mutant residues and enzymes of wild-type MetAP1s. The preliminary enzymatic experiments indicate that cysteine 70 or 202, at either Escherichia coli or human MetAP1, played a crucial role in the methionine hydrolysis.
A series of novel peptide-based β-thiolactones were synthesized and assayed for cytotoxicity against several human cancer cell lines, where they showed greater activity than the corresponding β-lactones and β-lactams. Several of the β-thiolactones prepared showed strong inhibitory activity in vitro against human cathepsins B and L.
Ribosomal Synthesis of Backbone-Cyclic Peptides Compatible with In Vitro Display
作者:Ryo Takatsuji、Koki Shinbara、Takayuki Katoh、Yuki Goto、Toby Passioura、Ryo Yajima、Yamato Komatsu、Hiroaki Suga
DOI:10.1021/jacs.8b05327
日期:2019.2.13
Backbone-cyclic peptides are an attractive class for therapeutic development. However, in vitro display technologies coupled with ribosomal synthesis are intrinsically inapplicable to such "phenotypes" because of loss of the C-terminal peptide region linking to "genotype". Here, we report a methodology enabling the display of backbone-cyclic peptides. To achieve this, genetic code reprogramming was
骨架环肽是治疗开发的一个有吸引力的类别。然而,结合核糖体合成的体外展示技术本质上不适用于此类“表型”,因为与“基因型”相关的 C 端肽区域丢失。在这里,我们报告了一种能够展示骨架环肽的方法。为了实现这一目标,利用遗传密码重编程来实施重排策略,包括将包含噻唑烷保护的半胱氨酸和 2-氯乙酰胺 (ClAc) 侧链的设计启动子的核糖体掺入,然后是下游位置的 α-硫代酸和半胱氨酸. 线性肽表达后,α-硫酯和半胱氨酸的硫醇基团之间发生自发的硫酯重排,释放 α-硫代基团并导致与上游 ClAc 侧链基团的交联。然后噻唑烷保护的半胱氨酸的选择性脱保护立即促进分子内天然化学连接,如各种序列和环大小所示。在这种方法中,骨架环肽通过侧链硫醚共价键保留其 C 端肽区域,使其与体外展示兼容。
Umpolung Reactivity in the Stereoselective Synthesis of S-Linked 2-Deoxyglycosides
作者:Kedar N. Baryal、Danyang Zhu、Xiaohua Li、Jianglong Zhu
DOI:10.1002/anie.201301682
日期:2013.7.29
Take control! An unprecedented sulfenylation of stereochemically defined 2‐deoxyglycosyl lithium species with asymmetric sugar‐derived disulfide acceptors enabled the stereoselectivesynthesis of both α‐ and β‐S‐linked 2‐deoxyoligosaccharides. Reductive lithiation of 2‐deoxyglycosyl phenylsulfides at −78 °C provides predominantly axial glycosyl lithium species, which upon warming isomerize to predominantly