Cyclopentadiene–Phosphine/Palladium-Catalyzed Cleavage of C–N Bonds in Secondary Amines: Synthesis of Pyrrole and Indole Derivatives from Secondary Amines and Alkenyl or Aryl Dibromides
作者:Weizhi Geng、Wen-Xiong Zhang、Wei Hao、Zhenfeng Xi
DOI:10.1021/ja308950d
日期:2012.12.19
An efficient Pd-catalyzed cleavage of C(sp(3))-Nbonds in secondary amines and a consequent C(sp(2))-N and C(sp(3))-N coupling process was developed. Various secondary amines could be used to react with alkenyl or aryl dibromides, affording pyrroles and indoles in high yields. Cyclopentadiene-phosphine ligands, a new type of P-olefin ligand, were found to be able to promote the efficiency of this Pd-catalyzed
Formation of Cyclopenta[<i>c</i>]pyridine Derivatives from 2,5-Disubstituted Pyrroles and 1,4-Dibromo-1,3-butadienes via Pyrrole-Ring One-Carbon Expansion
作者:Jianhao Yin、Qingyu Ye、Wei Hao、Shuaijing Du、Yucheng Gu、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1021/acs.orglett.6b03431
日期:2017.1.6
Reactions between 1,4-dibromo-1,3-butadienes and 2,5-disubstitutedpyrroles afforded cyclopenta[c]pyridine derivatives in high yield, catalyzed by palladium and a cyclopentadiene-phosphine ligand (L1). Insertion of one terminal carbon of the butadienyl skeleton into one C═C double bond in the pyrrole ring resulted in ring expansion, along with a 1,2-shift of an alkyl or an aryl substituent on the butadienes
1,4-二溴-1,3-丁二烯与2,5-二取代的吡咯之间的反应在钯和环戊二烯-膦配体(L1)的催化下以高收率提供了环戊[ c ]吡啶衍生物。丁二烯基骨架的一个末端碳插入吡咯环中的一个C═C双键会导致环膨胀,以及丁二烯上烷基或芳基取代基的1,2-移位。
Cyclopentadiene-Phosphine/Palladium-Catalyzed Synthesis of Indolizines from Pyrrole and 1,4-Dibromo-1,3-butadienes
作者:Wei Hao、Han Wang、Qingyu Ye、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1021/acs.orglett.5b02959
日期:2015.11.20
The cyclopentadienephosphine ligand (L1) and palladium were found to be an efficient catalyst system to activate the alpha-C(sp(2))H bond of pyrrole and indole derivatives. Various alkenyl or aryl dibromides could be used to react with pyrrole and indole derivatives to afford multisubstituted indolizines in high yields.