Investigations into the Kinetic Modeling of the Direct Alkylation of Benzylic Amines: Dissolution of K2CO3 Is Responsible for the Observation of an Induction Period
摘要:
Investigations into the kinetics of a Rh(I)-catalyzed direct C-H alkylation of benzylic amines with alkenes revealed that K2CO3, which is effectively insoluble in the reaction mixture, is only needed in the beginning of the reaction. During the concomitant induction period, K2CO3 is proposed to dissolve to a vanishingly small extent and the Rh-precatalyst irreversibly reacts with dissolved K2CO3 to form the active catalyst. The duration of this induction period is dependent on the molar loading, the specific surface, the H2O content of K2CO3, and agitation, and these dependences can be rationalized based on a detailed kinetic model.
it is possible to activate toluene efficiently and use it directly for the benzylation of different 2-aminopyridines. The transformation is not restricted to simple toluene, but also substituted derivatives give the desired product in good yields. Effective cleavage of the pyridine moiety is presented.
Aryl Bromides and Aryl Chlorides for the Direct Arylation of Benzylic Amines Mediated by Ruthenium(II)
作者:Navid Dastbaravardeh、Michael Schnürch、Marko D. Mihovilovic
DOI:10.1002/ejoc.201300004
日期:2013.5
importantly, also the cheaper aryl bromides and aryl chlorides can be applied as aryl sources. Additionally, the method does not require elaborate manipulations in a glove box and can be carried out in simple screw cap vials. Potassium pivalate proved to be beneficial for the transformation with aryl bromides or iodides as aryl source, but was not required for aryl chlorides. In the latter case, the addition
Ruthenium(II)-Catalyzed sp<sup>3</sup> C–H Bond Arylation of Benzylic Amines Using Aryl Halides
作者:Navid Dastbaravardeh、Michael Schnürch、Marko D. Mihovilovic
DOI:10.1021/ol301680v
日期:2012.7.20
protocol for the directarylation of benzylic amines was developed. Employing 3-substituted pyridines as directing groups, arylation was achieved usingarylbromides or aryl iodides as the aryl source. Potassium pivalate proved to be an important additive in this transformation. The arylation took place selectively in the benzylic sp3 position, and no significant competitive sp2arylation was observed
One-Pot Access to <i>peri</i>-Condensed Heterocycles via Manganese-Catalyzed Cascade C–N and C–C Bond Formation
作者:Yunliang Yu、Yadong Feng、Remi Chauvin、Shuangshuang Ma、Lianhui Wang、Xiuling Cui
DOI:10.1021/acs.orglett.8b01586
日期:2018.7.20
A Mn(III)-catalyzed three-component cascade C–H/N–H functionalization of 2-aminopyridines with 2 equiv of dialkyl butyndioates leads to peri-condensed tricylic azines through a selective, but partly destructive, stoichiometry. A wide range of 2,11-diazatricyclo[5.3.1.04,11]undeca-1(10),4,6,8-tetraen-3-ones were thus obtained with moderate to high yields in a step-economical fashion under mild conditions