A Facile Synthesis of Benzo[<i>h</i>
]quinolines via Silica-TsOH-P<sub>2</sub>
O<sub>5</sub>
Promoted Condensation of 1-Naphthylamines with 1,3-Diketones under Solvent Free Conditions
A facile synthesis of benzo[h]quinolines has been developed via improved Combes reaction. A combination of silica gel, p‐toluenesulfonic acid and phosphorus pentoxide was utilized to promote the condensation of 1‐naphthylamines with 1,3‐diketones under solvent free conditions. In this case, silica gel was used as reaction media, p‐toluenesulfonic acid and phosphorus pentoxide were acted as catalyst
通过改进的Combes反应,已轻松合成了苯并[ h ]喹啉。在无溶剂的条件下,将硅胶,对甲苯磺酸和五氧化二磷结合使用可促进1-萘胺与1,3-二酮的缩合。在这种情况下,硅胶用作反应介质,对甲苯磺酸和五氧化二磷分别充当催化剂和脱水剂。
Silver-catalyzed one-step synthesis of multiply substituted quinolines
A silver-catalyzed formation of C-C bond for the construction of a series of polysubstituted quinolines from arylamines, aldehydes, and ketones or arylamines and 1,3-diketones has been developed. The transformation is effective for a broad range of substrates, thus enabling the expansion of constituent architectures on the heterocyclic framework. This use of a single catalytic system to mediate chemical transformations in a synthetic operation is important for the development of new atom-economic strategies and this strategy is efficient in building complex structures from simple starting materials in an environmentally benign fashion. (C) 2015 Elsevier Ltd. All rights reserved.