Reactions of 2-Methyl- and 1,2-Dimethyl-1,4,5,6-tetrahydropyrimidine with Aroyl Chlorides: Diverse Reactivities of Cyclic Ketene N,N′-Acetals Generated in situ
作者:Charles Pittman Jr.、Guozhong Ye、Sabornie Chatterjee、Aihua Zhou、Bobby Barker、Chunlong Chen、Yingquan Song
DOI:10.1055/s-0029-1218670
日期:2010.4
N′-diaroyl cyclic ketene N,N-acetals that are inert to excess aroyl chlorides. No carbon-carbon bond was formed in these reactions. Conversely, 1,2-dimethyl-1,4,5,6-tetrahydropyrimidine reacted with three equivalents of aroyl chloride under the same conditions to give N-aroyl N′-methyl β,β-dioxo cyclic ketene N,N′-acetals, with formation of two carbon-carbon bonds. Various reactions of cyclic amidines
2-甲基- 1,4,5,6-四氢用在四氢呋喃-三乙胺芳酰氯两个当量反应,得到Ñ,Ñ '-diaroyl环状烯酮Ñ,Ñ -acetals是惰性的过量芳酰氯。在这些反应中没有形成碳-碳键。相反,在相同条件下,1,2-二甲基-1,4,5,6-四氢嘧啶与三当量的芳酰氯反应,得到N-芳酰基N'-甲基β,β-二氧代环烯酮N,N'-乙缩醛,形成两个碳-碳键。观察到环状am与芳酰氯的各种反应,并就环大小和取代基对就地产生的环状烯酮N,N'-缩醛的反应性的影响进行了讨论。 乙缩醛-芳酰氯-环am-嘧啶