Design and synthesis of sinomenine isoxazole derivatives <i>via</i> 1,3-dipolar cycloaddition reaction
作者:Hongmei Pan、Tong Lu、Xuedan Wu、Chengwen Gu、Naili Tao、Biao Zhang、Ao Wang、Guangmei Chen、Kehua Zhang、Jie Cheng、Jie Jin
DOI:10.1080/14786419.2019.1677649
日期:2021.7.18
3-chloropropyne. Another key intermediate product is 1,3-dipole, which can be obtained from aromatic aldehyde. After treatment with hydroxylamine hydrochloride and then sodium carbonate solution, aromatic aldehyde is converted to aldehyde oxime, which reacts with N-chlorosuccinimide (NCS) to afford aryl hydroximino chloride. 1,3-Dipole is eventually formed in situ while triethylamine (TEA) in DMF is added dropwise
摘要 以青藤碱盐酸盐和芳香醛为原料合成了一种新型结构的青藤碱异恶唑衍生物,需要六个步骤。以良好的收率获得了19个目标化合物。青藤碱盐酸盐在与氨中和反应和与3-氯丙炔取代反应后转化为4-炔基青藤碱,这是合成目标青藤碱异恶唑化合物的关键中间产物。另一个关键的中间产物是 1,3-偶极子,它可以从芳香醛中获得。用盐酸羟胺和碳酸钠溶液处理后,芳香醛转化为醛肟,与 N-氯代琥珀酰亚胺 (NCS) 反应生成芳基羟氨基氯化物。1,3-偶极子最终原位形成同时滴加 DMF 中的三乙胺 (TEA)。然后加入4-炔基青藤碱,通过1,3-偶极环加成反应作为关键步骤提供青藤碱异恶唑衍生物。所有目标化合物均通过熔点、1 H NMR、13 C NMR、HRMS和FT-IR光谱进行表征。