Combined Experimental and Computational Study on Ruthenium(II)-Catalyzed Reactions of Diynes with Aldehydes and <i>N</i>,<i>N</i>-Dimethylformamide
作者:Yoshihiko Yamamoto、Yuta Okude、Shota Mori、Masatoshi Shibuya
DOI:10.1021/acs.joc.7b01229
日期:2017.8.4
calculations [PCM (THF) M06L/SDD-6-311++G(d,p)//B3LYP/LanL2DZ-6-31G(d)] and control experiments. The (Z)-selectivity increased when the bulkiness of the diyne terminal substituents increased. Notably, the reaction of 1,6-diynes bearing tert-butyl terminal groups with various α,β-unsaturated aldehydes exclusively afforded (Z)-dienyl ketones even at 70 °C when a cationic ruthenium complex with a smaller η5-cyclopentadienyl
的1,6-二炔轴承用甲基端基环加成反应p -anisaldehyde使用与η阳离子钌催化剂进行5 -五甲基配位体在THF中在室温下通过最初形成的稠合的吡喃的开环,得到二烯基酮。使用钌催化剂选择性地获得了二烯基酮的(Z)-立体异构体,而先前报道的铑催化剂则产生了(E)-异构体。这些(ë) -和(Ž)-selectivities被动力学控制作为显示控制的实验,该ë / Ž(的-isomerization Ë)-二烯基酮在70°C的温度下发生10小时,以使E / Z比率接近1:1。对于钌催化剂这一特性立体选择性的来源归因于CPRU的直接开环+配位的理论计算[PCM(THF)M06L / SDD-6-311 ++ G(d的基础上吡喃复杂中间体, p)// B3LYP / LanL2DZ-6-31G(d)]和对照实验。当二炔末端取代基的体积增加时,(Z)-选择性增加。值得注意的是,即使在70°C时,