Synthesis of 5,6,7,8-Tetrahydroquinolines by Thermolysis of Oxime O-Allyl Ethers in the Presence of Boron Trifluoride Etherate.
作者:Junko KOYAMA、Tamaki OGURA、Kiyoshi TAGAHARA、Masaaki MIYASHITA、Hiroshi IRIE
DOI:10.1248/cpb.41.1297
日期:——
Thermolysis of cyclohexanone oxime O-crotyl and O-cinnamyl ether in the presence of BF3-etherate regioselectively gave 4-methyl- and 4-phenyl-5, 6, 7, 8-tetrahydroquinoline, while the addition of organic bases such as triethylamine and pyridine inhibited the rearrangement. These findings suggested that the addition of the acid made [1, 2] shift the predominant one of the two possible transformations, [1, 2] and [2, 3] shift, of the O-allyl ethers.
环己酮肟 O-巴豆基和 O-肉桂基醚在 BF3-醚化物存在下区域选择性地热解得到 4-甲基-和 4-苯基-5,6,7,8-四氢喹啉,同时加入有机碱如三乙胺和吡啶抑制重排。这些发现表明,酸的添加使 O-烯丙基醚的两种可能的转变([1, 2] 和 [2, 3] 转变)中的主要转变之一发生了 [1, 2] 转变。