Synthesis, characterization and X-ray studies of new chiral five-six-membered ring, [4.3.0] heterobicyclic system of monomeric boronates
作者:José María Rivera、Susana Rincón、Norberto Farfán、Rosa Santillan
DOI:10.1016/j.jorganchem.2011.03.006
日期:2011.6
Nine new boronates, six of them chiral, with five-six-membered ring heterobicycles were prepared by reaction of the Schiff bases and phenyl boronic acid. The boronates were fully characterized by spectroscopic techniques, NMR 1H, 13C, 11B, Infrared spectroscopy, mass spectrometry and elemental analysis. The reaction showed high diasteroselectivity, only in the case of compound 4c, containing a methyl
通过席夫碱和苯基硼酸的反应制备了九种新的硼酸盐,其中六种为手性,具有五六元环杂环。通过光谱技术,1 H,13 C,11 B NMR ,红外光谱,质谱和元素分析对硼酸盐进行了全面表征。该反应显示出高的非对映选择性,仅在化合物4c在脂族部分中包含甲基取代基的情况下,诱导很低,得到两种非对映异构体的2∶1混合物。结果表明,杂环中优选的立体化学是五元环中的所有取代基和与硼原子相连的苯基均在同一侧。