soluble tag-assisted liquid-phase peptide synthesis, the selective recovery of desired peptides and Ph3PO was achieved. Given that methods to reduce Ph3PO to Ph3P have been reported, Ph3PO could be a recyclable byproduct unlike byproducts from typical coupling reagents. Moreover, a commercial peptide active pharmaceutical ingredient (API), leuprorelin, was successfully synthesized without the use of traditional
从绿色化学的角度来看,偶联试剂产生的大量废物是肽合成的一个严重缺陷。为了克服这个问题,我们报告了一种双相系统中的电化学肽合成。三苯基膦 (Ph 3 P) 的阳极氧化生成膦自由基阳离子,作为偶联剂来活化羧酸,并产生作为化学计量副产物的三苯基氧化膦 (Ph 3 P O)。结合可溶性标签辅助液相肽合成,实现了所需肽和 Ph 3 P O的选择性回收。由于降低pH值法3 P O操作博士3已报道P,博士3P O的程序可能不像从典型的偶联剂副产品可回收副产品。此外,在不使用传统偶联剂的情况下成功合成了商业肽活性药物成分 (API) 亮丙瑞林。
Electrochemically Driven, Ni-Catalyzed Aryl Amination: Scope, Mechanism, and Applications
作者:Yu Kawamata、Julien C. Vantourout、David P. Hickey、Peng Bai、Longrui Chen、Qinglong Hou、Wenhua Qiao、Koushik Barman、Martin A. Edwards、Alberto F. Garrido-Castro、Justine N. deGruyter、Hugh Nakamura、Kyle Knouse、Chuanguang Qin、Khalyd J. Clay、Denghui Bao、Chao Li、Jeremy T. Starr、Carmen Garcia-Irizarry、Neal Sach、Henry S. White、Matthew Neurock、Shelley D. Minteer、Phil S. Baran
DOI:10.1021/jacs.9b01886
日期:2019.4.17
C-N cross-coupling is one of the most valuable and widespread transformations in organic synthesis. Largely dominated by Pd- and Cu-based catalytic systems, it has proven to be a staple transformation for those in both academia and industry. The current study presents the development and mechanistic understanding of an electrochemically driven, Ni-catalyzed method for achieving this reaction of high
CN 交叉偶联是有机合成中最有价值和最广泛的转化之一。它主要由 Pd 和 Cu 基催化系统主导,已被证明是学术界和工业界人士的主要转变。目前的研究展示了一种电化学驱动的镍催化方法的发展和机理理解,以实现这种具有高度战略重要性的反应。通过一系列电化学、计算、动力学和经验实验,该反应的关键机制特征已被揭开,从而产生了适用于广泛芳基卤化物和胺亲核试剂的第二代条件,包括复杂的例子寡肽、药用杂环、天然产物和糖。
Substituted 2-Imino-5-arylidenethiazolidin-4-one Inhibitors of Bacterial Type III Secretion
作者:Toni Kline、Heather B. Felise、Kathleen C. Barry、Stona R. Jackson、Hai V. Nguyen、Samuel I. Miller
DOI:10.1021/jm8004515
日期:2008.11.27
factors that help establish and maintain infection. Disruption of such secretion systems is a potentially effective therapeutic strategy. We developed a high-throughput screen and identified a tris-aryl substituted 2-imino-5-arylidenethiazolidin-4-one, compound 1, as an inhibitor of the type III secretion system. Expansion of this chemotype enabled us to define the essential pharmacophore for type III
G4 interactions. We next used this reactive handle to conjugate a BODIPY fluorophore to Phen-DC3. This generated a fluorescent derivative with retained G4 selectivity, G4 stabilization, and cellular effect that revealed the localization and function of Phen-DC3 in human cells. To increase cellular uptake, a second chemical probe with a conjugated cell-penetrating peptide was prepared using the same
triple-equivalent supports in liquid-phase peptide synthesis (LPPS). Through the support-aided precipitation effect of TFP derivatives, the peptide intermediates during peptide synthesis were separated and collected via rapid precipitation and facile filtration without chromatographic purification. Furthermore, the TFP derivative support can be directly recycled for reuse without further regeneration after