使用溶液相肽合成方法合成了N,N'-双[6-[([2-甲氧基苄基)氨基]己-1-基]胱胺的类似物(benextramine,BXT,2),并分析了取代特异性结合的活性1 nM N- [丙酰-3H]神经肽Y([3H] NPY)来自大鼠脑中对苯乙胺敏感的神经肽Y(NPY)结合位点。我们对这些类似物的新合成方法开始于,将胱胺与叔丁氧羰基(t-Boc)保护的6-氨基己酸的N-羟基琥珀酰亚胺酯酰化,然后用在二恶烷中的4 N HCl脱保护t-Boc基团。用适当取代的苯甲酸的N-羟基琥珀酰亚胺酯将该对称的二胺酰化,然后在回流的THF中用乙硼烷还原所得的四酰胺,得到目标化合物。缺乏苄基的BXT类似物(即化合物11)在浓度高达1.4 x 10(-3)M时没有[3H] NPY置换活性。邻位,间位和对位的活性范围是9倍在对苯达拉明敏感的NPY大鼠大脑结合位点的甲氧基,氯代和羟基苯达拉明类似物的区域异构体与在α-
Iron-Nitrate-Catalyzed Oxidative Esterification of Aldehydes and Alcohols with <i>N</i>
-Hydroxyphthalimide: Efficient Synthesis of <i>N</i>
-Hydroxyimide Esters
An Fe(NO3)3*9H2O-catalyzed cross-dehydrogenative coupling reaction between N-hydroxyphthalimide (NHPI) or N-hydroxysuccinimide (NHSI) and aldehydes or alcohols in the air has been described. This transformation provided an efficientapproach to prepare N-hydroxyimide ester derivatives with wide substrate scope in moderate to excellent yields.
Metal-free intermolecular C–O cross-coupling reactions: synthesis of N-hydroxyimide esters
作者:Yunhe Lv、Kai Sun、Weiya Pu、Shukuan Mao、Gang Li、Jiejie Niu、Qian Chen、Tingting Wang
DOI:10.1039/c6ra22653a
日期:——
Selectfluor-mediated intermolecular C–O crosscouplingreaction for the synthesis of N-hydroxyimide esters was developed for the first time. The reaction is applicable to the coupling of readily available aryl and alkyl aldehydes with N-hydroxyphthalimide (NHPI) and N-hydroxysuccinimide (NHSI). The resulting active esters can be directly converted into amides in onepot.
Cross-dehydrogenativecoupling (CDC) reactions of aldehydes with N-hydroxyimidates such as N-hydroxysuccinimide (NHSI), N-hydroxyphthalimide (NHPI) under catalyst-free conditions is described. Moreover, the desired products can be obtained simply by recrystallization from ethanol. This method is also applicable to the synthesis of amides in excellent yields. A radical mechanism of the type shown in