Pd-Catalyzed Cross-Coupling of Organostibines with Styrenes to Give Unsymmetric (<i>E</i>)-Stilbenes and (1<i>E</i>,3<i>E</i>)-1,4-Diarylbuta-1,3-dienes and Fluorescence Properties of the Products
A general and effective palladium-catalyzed cross-coupling of organostibines with styrenes to give (E)-olefins was disclosed. By the use of an organostibine reagent, this method can produce unsymmetric (E)-1,2-diarylethylenes and (1E,3E)-1,4-diarylbuta-1,3-dienes in good yields with high E/Z selectivity and good functional group tolerance. Resveratrol and DMU-212 were synthesized in high yield. The
公开了一种通用且有效的钯催化的有机锑与苯乙烯的交叉偶联,以得到 ( E )-烯烃。通过使用有机锑试剂,该方法可以以良好的收率和高E / Z制备不对称的 ( E )-1,2-二芳基乙烯和 (1 E ,3 E )-1,4-二芳基丁二烯-1,3-二烯选择性和良好的官能团耐受性。白藜芦醇和 DMU-212 以高产率合成。该协议可以扩展到 (1 E ,3 E ,5 E )-1,6-diphenylhexa-1,3,5-triene的合成,产率为 40%。产品5e、5f和7a 显示出良好的光致发光量子产率,范围为 72% 至 99%。
Iridium-Catalyzed Selective <i>trans</i>-Semihydrogenation of 1,3-Enynes with Ethanol: Access to (<i>E,E</i>)-1,4-Diarylbutadienes
precatalyst and tBuNH2 as the cocatalyst. This catalyst system provides an efficient and atom-economical access to unsymmetrical (E,E)-1,4-diarylbutadienes with high yields and stereoselectivities. Monitoring the process revealed that a sequence of cis-semihydrogenation of the triple bond of 1,3-enynes (to form (E,Z)-butadienes) and (E,Z)-to-(E,E) isomerization occurs to form (E,E)-butadienes.
使用新的 (PCN)Ir 配合物作为预催化剂和t BuNH 2作为助催化剂,开发了以乙醇为氢源的 1,3-烯炔的反式半氢化反应。该催化剂体系以高产率和立体选择性提供了一种高效且原子经济地获得不对称 ( E , E )-1,4-二芳基丁二烯的途径。监测过程显示,1,3-烯炔的三键顺式半氢化(形成 ( E , Z )-丁二烯)和 ( E , Z ) 到-( E , E ) 异构化形成( , _E )-丁二烯。
Ballistreri, Francesco P.; Maccarone, Emanuele; Perrini, Giancarlo, Journal of the Chemical Society. Perkin transactions II, 1982, p. 273 - 278
作者:Ballistreri, Francesco P.、Maccarone, Emanuele、Perrini, Giancarlo、Tomaselli, Gaetano A.、Torre, Michele
DOI:——
日期:——
LONGO, M. L.;PARISI, G.;PERRINI, G., BOLL. ACCAD. GIOENIA SCI. NATUR., 1982, 15, N 319, 65-73