Studies on quinoline and isoquinoline derivatives. VIII. Hydration and hydrogenation of ethynyl substituents attached to the pyridine moiety of quinoline and isoquinoline rings.
作者:SHOETSU KONNO、MASAFUMI SHIRAIWA、HIROSHI YAMANAKA
DOI:10.1248/cpb.29.3554
日期:——
Studies were carried out on the hydration and hydrogenation of the triple bond in quinoline and isoquinoline derivatives containing an ethynyl substituent linked directly to the pyridine moiety. Fourteen kinds of ethynyl quinolines and isoquinolines such as 2-, 3-, 4-phenylethynylquinoline, 2-, 3-, 4-(1-hexynyl) quinoline, 2-(1-propynyl) quinoline, 1-, 3-, 4-phenylethynylisoquinoline, 1-, 3-, 4-(1-hexynyl) isoquinoline, and 1-(1-propynyl)-isoquinoline were converted into the corresponding acylmethyl derivatives with high selectivity, when they were heated in dilute sulfuric acid in the presence of mercuric sulfate. In all cases, no products due to reverse hydration were isolated. Partial catalytic reduction of the ethynyl linkage of the above compounds is possible, while exhaustive reduction afforded quinolines and isoquinolines with a saturated side chain.
研究针对含有乙炔取代基与吡啶结构直接相连的喹啉和异喹啉衍生物的三重键的水合和氢化进行了研究。十四种乙炔喹啉和异喹啉,例如2-、3-、4-苯乙炔喹啉,2-、3-、4-(1-己炔)喹啉,2-(1-丙炔)喹啉,1-、3-、4-苯乙炔异喹啉,1-、3-、4-(1-己炔)异喹啉,和1-(1-丙炔)异喹啉,在稀硫酸中与硫酸汞共热时,高选择性地转化为相应的酰基甲基衍生物。在所有情况下,没有分离出由于反向水合产生的产物。上述化合物的乙炔键的部分催化还原是可行的,而彻底还原则生成侧链饱和的喹啉和异喹啉。