Rhodium-Catalyzed Alkenylation of Toluene Using 1-Pentene: Regioselectivity To Generate Precursors for Bicyclic Compounds
作者:Nichole S. Liebov、Weihao Zhu、Junqi Chen、Michael S. Webster-Gardiner、William L. Schinski、T. Brent Gunnoe
DOI:10.1021/acs.organomet.9b00535
日期:2019.10.14
compounds. The olefin concentration, copper(II) oxidant identity and concentration, reaction temperature, and rhodium concentration for the alkenylation of toluene with 1-pentene have been optimized using [Rh(η2-C2H4)2(μ-OAc)]2 as the catalyst precursor. The rhodium-based catalysis achieves up to 12(1):1 anti-Markovnikov selectivity for 1-tolyl-1-pentenes over 2-tolyl-2-pentenes and is selective for alkenylation
铑催化剂的芳烃烯基化报告由我们的基团(例如,科学2015,348,421; J.化学会志。2017,139,5474; 。。。J.化学会志2018,140,17007)已经证明选择性相对于γ-芳基烯烃(y> 1)。这种选择性非常显着,因为使用酸基的Friedel-Crafts芳烃烷基化或酸性沸石催化剂无法生成1-芳基烯烃或1-芳基烷烃。在本文中,我们报道了Rh芳烃烯基化催化作用的扩展,以生成1-tolyl-1-戊烯,它们是双环化合物的潜在前体。烯烃浓度,铜(II)氧化剂身份和浓度,反应温度,和铑的浓度为甲苯与1-戊烯的烯基化已被使用优化的[Rh(η 2 -C 2 H ^ 4)2(μ-OAC)] 2个作为催化剂的前体。铑基催化对2-甲苯基-2-戊烯的1-甲苯基-1-戊烯具有高达12(1):1的反马尔科夫尼科夫选择性,并且对间位和对位的烯基化反应具有选择性。