Catalytic C–H Activation of Phenylethylamines or Benzylamines and Their Annulation with Allenes
摘要:
Tetrahydro-3-benzazepines and tetrahydroiso-quinolines are synthesized in one,step from allenes and phenylethylamines or benzylamines,Mechanitically, it is assumed that activation of an aromatic ring with Pd(II) occurs, directed by the primary amine, leading to the formation of a palladacycltinto which'ari, allene then undergoes insertion. The resulting, pi-allyl intermediate cyclizes to the products by aniptramolecular allylic alkylation. The process is particularly useful with 2,3-butadienoates and amines having a quaternary carbon at the alpha-position.
Catalytic C–H Activation of Phenylethylamines or Benzylamines and Their Annulation with Allenes
摘要:
Tetrahydro-3-benzazepines and tetrahydroiso-quinolines are synthesized in one,step from allenes and phenylethylamines or benzylamines,Mechanitically, it is assumed that activation of an aromatic ring with Pd(II) occurs, directed by the primary amine, leading to the formation of a palladacycltinto which'ari, allene then undergoes insertion. The resulting, pi-allyl intermediate cyclizes to the products by aniptramolecular allylic alkylation. The process is particularly useful with 2,3-butadienoates and amines having a quaternary carbon at the alpha-position.
Synergistic Relay Reactions To Achieve Redox‐Neutral α‐Alkylations of Olefinic Alcohols with Ruthenium(II) Catalysis
作者:Chen‐Chen Li、Jian Kan、Zihang Qiu、Jianbin Li、Leiyang Lv、Chao‐Jun Li
DOI:10.1002/anie.201915218
日期:2020.3.9
the first Grignard-type nucleophilic addition using olefinicalcohols as latent carbonyl groups, providing a higher yield of the corresponding secondary alcohol than the classical hydrazone addition to aldehydes does. A broad scope of unsaturated alcohols and hydrazones, including some complex structures, can be successfully employed in this reaction, which shows the versatility of this approach and
Iron-Catalyzed Nucleophilic Addition Reaction of Organic Carbanion Equivalents via Hydrazones
作者:Chen-Chen Li、Xi-Jie Dai、Haining Wang、Dianhu Zhu、Jian Gao、Chao-Jun Li
DOI:10.1021/acs.orglett.8b01391
日期:2018.7.6
Earth-abundant and well-defined iron complexes are found to be cheap and effective catalysts for a series of “umpolung” nucleophilic additions of hydrazones. The new catalytic system not only maintains the broad substrate scope of an earlier expensive ruthenium system but also attains chemoselectivity of different kinds of carbonylgroups. Furthermore, the iron catalyst enables this reaction at ambient
PROCESS FOR PREPARING 4-CYCLOHEXYL-2-METHYL-2-BUTANOL
申请人:Ebel Klaus
公开号:US20130245132A1
公开(公告)日:2013-09-19
Process for preparing 4-cyclohexyl-2-methyl-2-butanol
The present invention relates to a process for preparing 4-cyclohexyl-2-methyl-2-butanol. The process comprises the following steps:
a) reaction of styrene with isopropanol at elevated temperature to obtain 4-phenyl-2-methyl-2-butanol, and
b) heterogeneously catalyzed hydrogenation of 4-phenyl-2-methyl-2-butanol over a catalyst suitable for ring hydrogenation of aromatics.