与生理pH相比,设计用于在酸性pH下进行选择性水解的pH敏感接头可用于在其作用部位选择性释放治疗剂。在本文中,研究了许多分子结构的水解裂解,据报道它们可用于pH敏感的递送系统。在经过测试的化学官能团中发现了各种各样的水解稳定性。即使在一个结构家族中,对取代模式的轻微修饰也会在水解稳定性方面产生意想不到的结果。这项工作使我们基于这些基团在pH 5.5时的反应性和在pH 5.5 vs. 5时的相对水解建立了这些基团的第一个分类。pH值7.4。从该分类中,选择了四个代表性的化学功能并进行了体外研究。结果表明,根据流式细胞仪测量,只有最活跃的功能才发生了明显的溶酶体裂解。这些最新结果质疑已知药物释放系统的基于酸的作用机理,并主张采用量身定制的方法进行深入的结构反应性研究对于合理设计和开发生物反应性接头的重要性。
Isocyanide based multicomponent reactions of oxazolidines and related systems
作者:Robert W. Waller、Louis J. Diorazio、Brian A. Taylor、William B. Motherwell、Tom D. Sheppard
DOI:10.1016/j.tet.2010.05.083
日期:2010.8
aldehydes/ketones, isocyanides and carboxylic acids. The reaction of oxazolidines without a nitrogen substituent was found to give either the expected Ugi products or the N-acyloxyethylamino acid amides depending on the choice of reaction conditions. Optimised reaction conditions were also developed for the ring-expansion of oxazolidines to morpholin-2-ones via reaction with an isocyanide followed by hydrolysis
Observations on the Reaction of <i>N</i>-Alkyloxazolidines, Isocyanides and Carboxylic Acids: A Novel Three-Component Reaction Leading to <i>N</i>-Acyloxyethylamino Acid Amides
N-Alkyloxazolidines, readily prepared by condensation of the parent carbonyl compounds with β-aminoalcohols, were found to undergo three-component reactions with isocyanides and carboxylic acids to give N-acyloxyethylamino acid derivatives in good yield. The reaction allows the variation of substituents at five different sites in the products through suitable choice of reagents.
Robbe; Fernandez; Dubief, European Journal of Medicinal Chemistry, 1982, vol. 17, # 3, p. 235 - 243
作者:Robbe、Fernandez、Dubief、et al.
DOI:——
日期:——
Reductive cleavage of N-substituted 2-aryl-1,3-oxazolidines: generation of .alpha.-amino-substituted carbanions
作者:Ugo Azzena、Giovanni Melloni、Cristina Nigra
DOI:10.1021/jo00076a033
日期:1993.11
The behavior of several N-substituted 2-aryl-1,3-oxazolidines has been investigated under conditions of electron transfer from alkali metals in aprotic solvents. The reduction led to the regioselective cleavage of the benzylic carbon-oxygen bond, with formation of the corresponding N-substituted benzylamino alcohols in good yields. Investigation of the mechanism of this reductive cleavage, with the aid of labeling experiments, showed the intermediate formation of alpha-tertiary amino-substituted carbanions.
Experiments on the Catalytic Hydrogenation of Oxazolidines