To condense N,N-dimethylacrylic aldehyde with cyclohexanone in the autoclave so as to prepare the important materials 5,6,7,8-tetrahydroquinoline.

• 用N,N-二甲基丙烯醛和环己酮在高压釜中进行缩合，直接制备出重要原料5,6,7,8-四氢喹啉；