Synthesis of 5,6‐Dihydropyrazolo[5,1‐
<i>a</i>
]isoquinoline and Ethyl (
<i>Z</i>
)‐3‐Acetoxy‐3‐tosylpent‐4‐enoate through Tertiary‐Amine‐Catalyzed [3+2] Annulation
作者:Yu Lei、Jiao‐Jiao Xing、Qin Xu、Min Shi
DOI:10.1002/ejoc.201600577
日期:2016.7
catalyzed divergent [3+2] annulation of C,N-cyclic azomethine imines with δ-acetoxyallenoates was developed; 5,6-dihydropyrazolo[5,1-a]isoquinolines and ethyl (Z)-3-acetoxy-3-tosylpent-4-enoates were afforded in moderate to good yields in a one-pot manner under mild conditions. This annulation reaction provides a highly efficient method to construct dinitrogen-fused heterocycles and ethyl (Z)-3-ace
开发了 1,4-二氮杂双环 [2.2.2] 辛烷 (DABCO) 催化的 C,N-环状偶氮甲亚胺与 δ-乙酰氧基烯丙酸酯的发散 [3+2] 环化;5,6-二氢吡唑并[5,1-a]异喹啉和(Z)-3-乙酰氧基-3-甲苯磺酰戊-4-烯酸乙酯在温和条件下以一锅法以中等至良好的产率提供。这种环化反应提供了一种同时构建二氮稠合杂环和 (Z)-3-乙酰氧基-3-tosylpent-4-enoates 的高效方法。