Bismuth triflate-L(−)-proline catalyzed synthesis of chiral 2,5-diaryl-2,3-dihydropyrano[2,3-b]quinolin-4-ones
作者:Nitu Mahajan、Surrinder Koul、Tej K. Razdan
DOI:10.1002/jhet.762
日期:2011.11
The synthesis of chiral (2R) 2,5‐diaryl‐2,3‐dihydropyrano[2,3‐b]quinolin‐4‐ones, was achieved, at ambient temperature, by the reaction of 3‐acetyl‐4‐aryl‐carbostyril and an aldehyde, in the presence of bismuth triflate–L(−)‐proline complex, formed in situ. The products were obtained in 62–78% yield with high enantioselectivity (72–96% ee). J. Heterocyclic Chem., (2011).
在环境温度下,通过3-乙酰基-4-芳基的反应可以实现手性(2 R)2,5-二芳基-2,3-二氢吡喃[2,3-b]喹啉-4-酮的合成。在三氟甲磺酸铋-L(-)-脯氨酸配合物的存在下,原位形成了卡斯托基利和醛。以62-78%的收率获得了高对映选择性(72-96%ee)的产品。J.杂环化学。(2011)。