Efficient synthesis of functionalized dihydroquinolines, quinolines and dihydrobenzo[b]azepine via an iron(<scp>iii</scp>) chloride-catalyzed intramolecular alkyne–carbonyl metathesis of alkyne tethered 2-amino benzaldehyde/acetophenone derivatives
作者:Swapnadeep Jalal、Krishnendu Bera、Soumen Sarkar、Kartick Paul、Umasish Jana
DOI:10.1039/c3ob42292e
日期:——
developed an efficient synthesis of 1,2-dihydroquinoline and dihydrobenzo[b]azepine derivatives involving the iron(III) chloride intramolecular alkyne–carbonyl metathesis reaction for the first time. Various functionalized 1,2-dihydroquinolines and dihydrobenzo[b]azepines were prepared from easily accessible substrates in the presence of environmentally friendly and inexpensive iron(III) chloride (10 mol%)
在这项研究中,我们首次开发了一种有效的合成1,2-二氢喹啉和二氢苯并[ b ]氮杂衍生物的方法,该方法涉及氯化铁(III)的分子内炔烃-羰基复分解反应。在环境友好且廉价的氯化铁(III)(10 mol%)的存在下,在温和的条件下,由易于获得的底物制备了各种官能化的1,2-二氢喹啉和二氢苯并[ b ]氮杂s 。该方法适用于范围广泛的包含不同官能团的基材,并以高至优异的产率提供了装饰产品。该方法进一步扩展到一个一锅法合成的3-酰基喹啉通过通过添加NaOH / EtOH ,N-炔丙基-2-氨基苯甲醛/苯乙酮衍生物进行炔烃-羰基复分解/脱甲苯基化/芳构化。尽管对许多路易斯酸和布朗斯台德酸催化剂进行了研究,但无水氯化铁(III)却是该转化的最佳催化剂。