Cascade C═O/C═C/C–N Bond Formation: Metal-Free Reactions of 1,4-Diynes and 1-En-4-yn-3-ones with Isoquinoline and Quinoline <i>N</i>-Oxides
作者:Bing Zhang、Long Huang、Shiwei Yin、Xuetong Li、Tao Xu、Biyang Zhuang、Tao Wang、Zunting Zhang、A. Stephen K. Hashmi
DOI:10.1021/acs.orglett.7b01996
日期:2017.8.18
The metal-free reactions of 1,4-diynes and 1-en-4-yn-3-ones with isoquinoline and quinoline N-oxides are developed, resulting in the formation of 3,4-dihydro-2H-pyrido[2,1-a]isoquinolines and 2,3-dihydro-1H-pyrido[1,2-a]quinolines via cascade C═O/C═C/C–N bond formation. It is the first report in which in the alkyne oxidation by N-oxides both the oxygen atom of N-oxides and the nitrogen atom are involved
发展了1,4-二炔和1-en-4-yn-3- one与异喹啉和喹啉N-氧化物的无金属反应,导致形成3,4-二氢-2H-吡啶[2, 1- a ]异喹啉和2,3-二氢-1H-吡啶并[1,2- a ]喹啉通过级联C═O/C═C/ C-N键形成。它是其中在由炔烃氧化的第一份报告Ñ -oxides两者的氧原子Ñ -oxides及氮原子参与了第二个C -杂原子键的形成。反应显示出较宽的底物范围和官能团耐受性。此外,发现该产物在DMSO中显示绿蓝色荧光,荧光量子产率高达0.59。