Department of Chemistry, University of California, Riverside, California 92521, United States.
Org Lett. 2022 Jul 1;24(25):4680-4683. doi: 10.1021/acs.orglett.2c01859. Epub 2022 Jun 16.
Sulfated zirconium oxide (SZO) capped with silylium-like ions reacts with (cod)Ir(py)Cl (cod = 1,5-cyclooctadiene; py = pyridine) to form [Ir(cod)py][SZO] () and MeSiCl. can also be formed in reactions of phosphonium functionalized SZO and [Ir(cod)(OSi(OBu)], which forms [Ir(cod)P(Bu)Ph][SZO] (), followed by reaction with pyridine to form . FTIR and N{H} MAS NMR spectroscopy are consistent with coordination of pyridine in to an electrophilic iridium. is moderately active in the dearomative hydroboration of pyridine. The primary product of this reaction is 1,2-dihydropyridine, which converts to the 1,4-dihydropyridine product at long reaction times. catalyzes the dearomative hydroboration of a variety of substituted pyridines and is also reactive toward pyrazines and -methylimidazole.
磺酸化氧化锆（SZO）被硅鎓样离子封端，与（cod）Ir（py）Cl（cod=1,5-环辛二烯；py=吡啶）反应，形成[Ir（cod）py][SZO]（）和MeSiCl。在磷官能化 SZO 与[Ir（cod）（OSi（OBu）]的反应中也可以形成[Ir（cod）P（Bu）Ph][SZO]（），然后与吡啶反应形成。FTIR 和 N{H} MAS NMR 光谱与吡啶在[Ir（cod）P（Bu）Ph][SZO]（）中的配位一致，形成亲电铱。在吡啶的去芳构化硼氢化反应中，表现出中等活性。该反应的主要产物是 1,2-二氢吡啶，在较长的反应时间内转化为 1,4-二氢吡啶产物。可以催化各种取代吡啶的去芳构化硼氢化反应，并且对吡嗪和-甲基咪唑也具有反应性。
