3-Hydroxypyrrolo[2,3-b]pyridine and related compounds – indoxyl analogues with fused electron deficient rings
作者:Alexander P. Gaywood、Hamish McNab
DOI:10.1039/c0ob00076k
日期:——
2-position and reacts with methoxymethylene Meldrum's acid at the 1-position. FVP of the corresponding acetyltetrazolo[1,5-a]quinoline 19 was much more complex, with 2-(cyanophenyl)acetonitrile 30 (rather than a heteroindoxyl) the major product at 750 °C. FVP of 3-acetyl-4-azidoquinoline 24 at 400 °C gave 3-methylisoxazolo[4,3-c]quinoline 33, but rearrangement to the heteroindoxyl was not observed at
闪蒸真空热解(FVP) 4-乙酰基四唑并[1,5- a ]吡啶 5在400°C时可提供3-甲基异恶唑并[3,4- b ]吡啶 通过X射线晶体学证实其结构的6。在较高的热解温度下,不稳定异吲哚基 获得8,它以酮形式存在(1,2-二氢吡咯并[2,3- b ]吡啶-3-)8K英寸CDCl 3 溶液和烯醇互变异构体(3-羟基吡咯并[2,3- b ]吡啶)8E在二甲基亚砜。这异吲哚基 8氧化二聚为异靛蓝9,在2位发生缩合反应并与甲氧基亚甲基Meldrum的酸位于1位。FVP对应乙酰四唑并[1,5- a ]喹啉 19要复杂得多,2-(氰基苯基)乙腈 主要产品在750°C下达到30(而不是杂吲哚基)。的FVP3-乙酰基-4-叠氮喹啉 在400°C下243-甲基异唑并[4,3- c ]喹啉 如图33所示,但在较高温度下未观察到重配成杂吲哚基。