Zn(L-proline)<sub>2</sub>as an efficient and reusable catalyst for the multi-component synthesis of pyran-annulated heterocyclic compounds
作者:Daryoush Tahmassebi、John E. Blevins、Shori S. Gerardot
DOI:10.1002/aoc.4807
日期:2019.4
multi‐component one‐pot synthesis of 2‐amino‐3‐cyano‐4H‐pyrans and pyran‐annulated heterocyclic compounds. Zn(L‐proline)2 has been utilized as a mild and efficient Lewis acid catalyst for the three‐component reaction of aromatic aldehydes, malononitrile and enolizable C‐H acids or activated phenols to synthesize pyran‐annulated scaffolds. 3‐Methyl‐1‐phenyl‐2‐pyrazolin‐5‐one, 4‐hydroxycoumarine, dimedone
我们已经开发出了一种简单,直接,高效的多组分一锅法合成2-氨基-3-氰基-4-H-吡喃和吡喃环化的杂环化合物。Zn(L-脯氨酸)2已被用作温和有效的路易斯酸催化剂,用于芳族醛,丙二腈和可烯化的C-H酸或活性酚的三组分反应来合成吡喃环化的支架。3-甲基-1-苯基-2-吡唑啉-5-酮,4-羟基香豆碱,二甲酮,4-羟基-6-甲基-2-吡喃酮,间苯二酚,1-萘酚和2-萘酚用作活化的C-H酸。通过真空过滤不使用任何色谱法以高收率分离产物。回收Zn(L-脯氨酸)2并在另一个反应中重复使用(三次),而没有明显的活性损失。