Geminal systems. 50. Synthesis and alcoholysis of N-acyloxy-N-alkoxy derivatives of ureas, carbamates, and benzamides
摘要:
Procedures were developed for the synthesis of N-acyloxy-N-alkoxy derivatives of ureas, carbamates, and benzamides by the reactions of the corresponding N-alkoxy-N-chloro derivatives with sodium carboxylates in MeCN. N-Chloro-N-etlioxy-p-toluenesulfonamide was inert in this reaction. Alcoholysis of N-acyloxy-N-alkoxy derivatives of ureas, carbamates, and tert-alkylamines afforded the corresponding N,N-dialkoxy derivatives, whereas alcoholysis of N-acetoxy-N-ethoxybenzamide gave rise to alkyl benzoates.
作者:Harrison S. Ewan、Christine S. Muli、Steven Touba、Amy T. Bellinghiere、Anne M. Veitschegger、Travis B. Smith、William L. Pistel、William T. Jewell、Rebecca K. Rowe、John P. Hagen、Hasan Palandoken
DOI:10.1016/j.tetlet.2014.07.036
日期:2014.8
straightforward synthesis of a novel class of sugar surfactants is described. The key step is the chemoselective condensation of a hydrophobic alkoxyamine with the resident aldehyde/ketone moiety on a hydrophilic sugar. Neither protection/deprotection of the sugars nor extensive product purification is required. The method allows for the facile adjustment of hydrophobic and hydrophilic domains of the sugar oxime
Synthetic Chemoselective Rewiring of Cell Surfaces: Generation of Three-Dimensional Tissue Structures
作者:Debjit Dutta、Abigail Pulsipher、Wei Luo、Muhammad N. Yousaf
DOI:10.1021/ja2022569
日期:2011.6.8
chemoselective cell-surface engineering based on liposome delivery and fusion to display bio-orthogonal functionalgroups from cell membranes. This strategy uses liposome fusion for the delivery of ketone or oxyamine groups to different populations of cells for subsequent cell assembly via oxime ligation. We demonstrate how this method can be used for several applications including, the delivery of
通过物理接触进行适当的细胞间通讯对于一系列基本生物过程至关重要,包括细胞增殖、迁移、分化和细胞凋亡,以及器官和其他多细胞组织的正确功能。体内这些细胞相互作用的空间和时间安排是动态的,并导致在体外极难概括的高阶功能。开发三维 (3D) 体外模型系统来研究这些复杂的体内互连性,将产生研究这些过程的生化信号的新方法,并为组织工程技术提供平台。在此处,我们开发并采用了一种策略,通过基于脂质体递送和融合的化学选择性细胞表面工程,在 3D 中诱导特异性和稳定的细胞 - 细胞接触,以显示来自细胞膜的生物正交功能组。该策略使用脂质体融合将酮或羟胺基团传递到不同的细胞群,以便通过肟连接进行后续细胞组装。我们展示了该方法如何用于多种应用,包括将试剂递送至细胞以进行荧光标记和细胞表面工程、小型 3D 球体细胞组件的形成以及大而致密的 3D 多层组织的生成。像用于组织工程应用的结构。该策略使用脂质体融合将酮或羟胺
Cell-Surface Engineering by a Conjugation-and-Release Approach Based on the Formation and Cleavage of Oxime Linkages upon Mild Electrochemical Oxidation and Reduction
作者:Abigail Pulsipher、Debjit Dutta、Wei Luo、Muhammad N. Yousaf
DOI:10.1002/anie.201404099
日期:2014.9.1
We report a strategy to rewire cell surfaces for the dynamic control of ligand composition on cell membranes and the modulation of cell–cell interactions to generate three‐dimensional (3D) tissue structures applied to stem‐cell differentiation, cell‐surface tailoring, and tissue engineering. We tailored cell surfaces with bioorthogonal chemical groups on the basis of a liposome‐fusion and ‐delivery
Compositions and methods for promoting liposomal and cellular adhesion
申请人:Yousaf Muhammad Naveed
公开号:US09080144B2
公开(公告)日:2015-07-14
The present application describes compounds, compositions and methods for incorporating chemoselective and bio-orthogonal complementary functional groups into liposomes. The present application also describes various uses of these modified liposomes including for tethering the chemoselective and bio-orthogonal complementary functional groups from cell surfaces by liposome delivery toward the goal of rewiring the cell surface.
Base-Promoted Formal [3 + 2] Cycloaddition of α-Halohydroxamates with Carbon Disulfide to Synthesize Polysubstituted Rhodanines
作者:Xiaoqiang Lei、Juan Feng、Qinglan Guo、Chengbo Xu、Jiangong Shi
DOI:10.1021/acs.orglett.2c00736
日期:2022.4.22
concise and practical strategy via potassium-carbonate-mediated [3 + 2]-cycloaddition reaction of α-halohydroxamates with the common solvent carbon disulfide for the synthesis of functionalized rhodanine derivatives in good to excellent yields is developed. The present methodology features a wide substrate scope as well as good functional group tolerance. The potential synthetic utility of this protocol