Nitrosobenzene-Mediated C−C Bond Cleavage Reactions and Spectral Observation of an Oxazetidin-4-one Ring System
作者:Joshua N. Payette、Hisashi Yamamoto
DOI:10.1021/ja804325f
日期:2008.9.17
remain relatively undeveloped. We report a novel, transition-metal-free oxidative C-C bond cleavage process for a broad range of ester and dicarbonyl compounds involving carbanion addition to nitrosobenzene. ReactIR experiments on the nitrosobenzene-mediated oxidative decarboxylation of esters indicate the reaction proceeds via fragmentation of a previously unobserved oxazetidin-4-one heterocycle, characterized
虽然键形成过程传统上引起了化学界的关注,但促进键断裂的方法仍然相对不发达。我们报告了一种新颖的、无过渡金属的氧化 CC 键裂解过程,用于广泛的酯和二羰基化合物,包括碳负离子加成到亚硝基苯。对亚硝基苯介导的酯类氧化脱羧反应的 ReactIR 实验表明,该反应是通过先前未观察到的 oxazetidin-4-one 杂环的断裂而进行的,其特征是在 1846 cm-1 处具有强烈的 IR 拉伸频率。这些机理研究允许该协议进一步扩展到各种 β-酮酯和 1,3-二酮底物的酮裂解反应。
Retro-ene reactions in heterocyclic synthesis.<b>IV</b>. A new synthetic method for 6-hydroxypyrimidin-4(3<i>H</i>)-ones and 1,3,5-triazine-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Kunio Ito、Shingo Miyajima
DOI:10.1002/jhet.5570360107
日期:1999.1
N-t-Butylbenzamidines 1 reacted with diphenyl phenylmalonate or diphenyl methylmalonate to give 6-hydroxypyrimidin-4(3H)-ones 4 or 5. Amidines 1 on reaction with diphenyl imidodicarboxylate afforded 1,3,5-triazine-2,4(1H, 3H)-diones 8.
N-吨-Butylbenzamidines 1与碳酸二苯苯基丙二或二苯基甲基丙反应,得到6-羟基嘧啶-4-(3 H ^) -酮4或5脒1上,得到与碳酸二苯imidodicarboxylate反应-1,3,5-三嗪-2,4( 1 H,3 H)-二酮8。
Zur Chemie des 4-Hydroxy-cumarins
作者:E. Ziegler、H. Junek
DOI:10.1007/bf00903604
日期:——
Oxidative Hydroxylierung von heterocyclischen ?-Dicarbonylberbindungen