Synthesis and evaluation of photolabile sulfonamides as potential reagents for rapid photorelease of neuroactive amines
作者:John E. T. Corrie、George Papageorgiou
DOI:10.1039/p19960001583
日期:——
The synthesis is described of photolabile sulfonamide derivatives of amino acids, most of which incorporate a monophosphate ester to promote water solubility. Points of particular synthetic interets include observations on the reduction of diaryl ketones and diarylmethanols, e.g. compounds 7 and 9, with NaBH4–TFA, and a convenient, effective sequence for conversion of bromoarenes into arenesulfonyl halides, e.g. 10 → 13. Photolysis of the glycine derivative 18a in aqueous solution released free glycine in poor yield, except in the presence of a very large excess of ascorbate as a reducing agent. The likely cause is discussed in terms of a decarboxylation side-reaction occurring during the overall progress of the photocleavage.
合成了光敏性氨基酸磺酰胺衍生物,大多数衍生物 incorporate 了单磷酸酯以促进水溶性。合成过程中特别关注的点包括对二芳基酮和二芳基醇的还原观察,例如化合物 7 和 9,使用 NaBH4–TFA 进行还原。此外,还展示了将溴芳烃转化为芳烃磺酰卤化物的方便有效的合成序列,例如 10 → 13。在水相溶液中,光解甘氨酸衍生物 18a 释放出的游离甘氨酸产量较低,除非在大量过量的抗坏血酸作为还原剂的存在下。讨论了可能的原因,认为是在光裂解的整体进程中发生了脱羧反应的副反应。