L-Proline Catalyzed Synthesis of Novel 5-{[2-(2-phenylpiperazin-1-yl)quinolin] methylene}-2,4-dione Derivatives
作者:S.S. Praveen Kumar Darsi、K. Shiva Kumar、B. Rama Devi、A. Naidu、P.K. Dubey
DOI:10.2174/1570178611999140404113821
日期:2014.6
L-proline is found to be an efficient catalyst for the Knoevenagel condensation of 2-chloroquinoline-3-
carboxaldehyde 1a-c with an active methylene compound i.e., 2,4-thazolidinedione 2 in IPA affording novel substituted
olefins 3a-c. The latter products reacted with N-substituted-3-phenylpiperazine 4a-c in the presence of KF in DMF to
afford the corresponding 5-[2-(2-phenylpiperazin-1-yl)quinolin]methylene}-2,4-dione derivatives 6a-i. Alternatively, 6ai
were also synthesized from another reaction sequence 1 → 5 → 6. The structures of the synthesized compounds have
been established on the basis of spectral and analytical data.
研究发现,L-脯氨酸是一种高效催化剂,可用于 2-氯喹啉-3-甲醛 1a-c 与活性亚甲基化合物(即 2,4-噻唑烷二酮 2)在 IPA 中进行 Knoevenagel 缩合反应,生成新型取代烯烃 3a-c。后者与 N-取代-3-苯基哌嗪 4a-c 在 DMF 中的 KF 存在下反应,得到相应的 5-[2-(2-苯基哌嗪-1-基)喹啉]亚甲基}-2,4-二酮衍生物 6a-i。另外,6ai 也是由另一个反应序列 1 → 5 → 6 合成的。根据光谱和分析数据确定了合成化合物的结构。