Efficient Synthesis of 2-Substituted Indoles Based on Palladium(II) Acetate/Tri-tert-butylphosphine-Catalyzed Alkynylation/Amination of 1,2-Dihalobenzenes
作者:Zhen-Yu Tang、Qiao-Sheng Hu
DOI:10.1002/adsc.200606022
日期:2006.5
A simple, efficientpalladium(II) acetate/tri-tert-butylphosphine-catalyzedindolesynthesis from o-alkynylhalobenzenes, readily available from 1,2-dihalobenzenes, has been achieved in good to excellent yields. A one-pot, Pd(OAc)2/t-Bu3P-catalyzed sequential reaction from 1-chloro-2-iodobenzene, phenylacetylene and amines has also been achieved in good yields.
由邻-炔基卤代苯简单,有效的乙酸钯(II)/三叔丁基膦催化的吲哚合成,可以容易地从1,2-二卤代苯获得,收率良好至极佳。还已经以良好的产率实现了由1-氯-2-碘苯,苯乙炔和胺进行的一锅法Pd(OAc)2 / t - Bu 3 P催化的顺序反应。
TiCl<sub>4</sub>-Catalyzed Indirect Anti-Markovnikov Hydration of Alkynes: Application to the Synthesis of Benzo[<i>b</i>]furans
作者:Lutz Ackermann、Ludwig T. Kaspar
DOI:10.1021/jo070887i
日期:2007.8.1
An efficient methodology for the indirect anti-Markovnikov hydration of unsymmetrically substituted terminal and internal alkynes is based on TiCl4-catalyzed hydroamination reactions. Its application to ortho-alkynylhaloarenes, followed by a copper-catalyzed O-arylation, provides flexible access to substituted benzo[b]furans.
一种不对称取代的末端和内部炔烃的间接反马氏水合的有效方法是基于TiCl 4催化的加氢胺化反应。其在邻炔基卤代芳烃上的应用,然后在铜催化的O-芳基化反应中,可以灵活地获得取代的苯并[ b ]呋喃。
Annulation of internal alkynes through a hydroamination/aza-Heck reaction sequence for the regioselective synthesis of indoles
作者:Lutz Ackermann、René Sandmann、Amparo Villar、Ludwig T. Kaspar
DOI:10.1016/j.tet.2007.10.117
日期:2008.1
Highly regioselective annulation reactions of unsymmetrically substituted alkynes by primary 2-bromo or 2-chloroanilines are achieved with an efficient one-pot protocol, which relies on a regioselective TiCl4-catalyzed intermolecular hydroamination and a subsequent palladium-catalyzed intramolecular aza-Heck reaction. The use of unsymmetrically substituted alkynes in this strategy enables the synthesis