An efficient synthesis of N-acetyl-2-substituted indole derivatives via direct intramolecular hydroamination of N-acetyl-2-alkynylaniline derivatives was developed. The reaction could be applied to a wide range of substrates employing only 1–2 mol% of PtCl4 as the catalyst to furnish the desired indole products in moderate to excellent yields. The current protocol is efficient, reliable and scalable
Palladium catalyzed reaction of 2-alkynylanilines with allyl chlorides. Formation of 3-allylindoles
作者:Koji Iritani、Seijiro Matsubara、Kiitiro Utimoto
DOI:10.1016/s0040-4039(00)82047-x
日期:1988.1
Pd(II) catalyzed reaction of N-carbomethoxy-2-alkynylanilines with allylchlorides produces 2-alkyl-3-allyl-N-carbomethoxyindoles in the presence of oxirances; Aminopalladation of a N-carbomethoxy-2-alkynylaniline gives 3-(N-carbomethoxyindolyl)palladium intermediate, which regioselectively attacks on the γ position of chlorides to give 3-allyl-2-alkylindoles with concurrent regeneration of Pd(II)
Catalytic asymmetric hydrogenation of indoles using a rhodium complex with a chiral bisphosphine ligand PhTRAP
作者:Ryoichi Kuwano、Manabu Kashiwabara、Koji Sato、Takashi Ito、Kohei Kaneda、Yoshihiko Ito
DOI:10.1016/j.tetasy.2006.01.016
日期:2006.2
Highly enantioselective hydrogenation of N-protected indoles was successfully developed by use of the rhodium catalyst generated in situ from [Rh(nbd)2]SbF6 and the chiralbisphosphine PhTRAP, which can form a trans-chelate complex with a transition metal atom. The PhTRAP–rhodium catalyst required a base (e.g., Cs2CO3) for the achievement of high enantioselectivity. Various 2-substituted N-acetylindoles
通过使用由[Rh(nbd)2 ] SbF 6原位生成的铑催化剂和手性双膦PhTRAP,可以成功地开发出N-保护的吲哚的高度对映选择性氢化反应,可以与过渡金属原子形成反式-螯合物。PhTRAP-铑催化剂需要碱(例如Cs 2 CO 3)才能实现高对映选择性。将各种2-取代的N-乙酰吲哚转化为具有高达95%ee的相应的手性二氢吲哚。3-取代的N - tosylindoles的氢化产生二氢吲哚,其在3-位具有立体异构中心,具有高的对映异构体过量(至多98%ee)。
Ruthenium-Catalyzed Cycloisomerization of 2-Alkynylanilides: Synthesis of 3-Substituted Indoles by 1,2-Carbon Migration
作者:Takuma Watanabe、Yuichiro Mutoh、Shinichi Saito
DOI:10.1021/jacs.7b04564
日期:2017.6.14
We developed ruthenium-catalyzedcycloisomerization of alkynylanilides that gave 3-substituted indoles in high yields. The reaction proceeded via the disubstituted vinylidene ruthenium complex that was formed by the 1,2-carbon migration.
Controllable <i>O</i>-Nucleometalation Cyclization Strategy: Access to Divergent Ring-Functionalized Molecules
作者:Jia Zheng、Zun Li、Wanqing Wu、Huanfeng Jiang
DOI:10.1021/acs.orglett.6b02710
日期:2016.12.16
The vinyl moiety-assisted selective O-nucleopalladation is reported, which offers rapid constructions of cycloolefins and cyclopropanes via oxidant-induced cyclization of enynes. O2 resulted in the unexpected 6-endo-Heck cyclization, while CuCl2 led to a 5-exo-trig pathway and synergetic SN2-type C–C bond formation. Amide works as an O-transferred nucleophilic group to activate the alkyne moiety, which
报道了乙烯基部分辅助的选择性O-核钯,其通过氧化剂诱导的炔烃环化提供了环烯烃和环丙烷的快速构造。O 2导致出乎意料的6-内-Heck环化,而CuCl 2导致5 -exo-trig途径和S N 2型CC协同键形成。酰胺充当O转移的亲核基团,以激活炔烃部分,从而诱导发散的环化过程。此外,再生的酰胺可用于进一步的修饰。