Versatile Syntheses of Alkynyl- and Substituted Alkynylcyclopropanes: 2-Alkoxyethynylcyclopropanes for the Anellation of Bicyclo[3.3.0]octane Fragments
Introducing the Dihydro-1,3-azaboroles: Convenient Entry by a Three-Component Reaction, Synthetic and Photophysical Application
作者:Jun Li、Constantin G. Daniliuc、Kalathil K. Kartha、Gustavo Fernández、Gerald Kehr、Gerhard Erker
DOI:10.1021/jacs.0c12236
日期:2021.2.3
unprecedented dihydro-1,3-azaborole derivatives 16. The tolane-derived example 16a was deprotonated and used as a ligand in organometallic chemistry. Compounds 16 served as the starting materials for the straightforward synthesis of various dihydro-1,3-azaborinine derivatives by treatment with an isonitrile. Several diaryldihydro-1,3-azaboroles showed interesting photophysicalproperties such as aggregation-induced
Stereodivergent Formation of Alkenylsilanes:syn oranti Hydrosilylation of Alkynes Catalyzed by a Cyclopentadienylcobalt(I) Chelate Bearing a Pendant Phosphane Tether
作者:Li Yong、Karin Kirleis、Holger Butenschön
DOI:10.1002/adsc.200606028
日期:2006.5
alkynes is catalyzed by the di-tert-butylphosphanylethylcyclopentadienylcobalt chelate 1. While the reaction of internal alkynes exclusively affords syn hydrosilylation products with triethylsilane, the reaction with triethoxysilane shows predominant anti stereoselectivity. Reactions of terminal alkynes are less selective with triethylsilane and result in cyclotrimerization when triethoxysilane is used
Silver-Catalyzed [2+1] Cyclopropenation of Alkynes with Unstable Diazoalkanes:<i>N</i>-Nosylhydrazones as Room-Temperature Decomposable Diazo Surrogates
作者:Zhaohong Liu、Qiangqiang Li、Peiqiu Liao、Xihe Bi
DOI:10.1002/chem.201605335
日期:2017.4.6
The [2+1] cycloaddition of alkynes with diazo compounds represents one of the most powerful and reliable methods for the construction of cyclopropenes. However, it remains a formidable challenge to accomplish the cyclopropenation of alkynes with non‐stabilized diazoalkanes, owing to the fact that such compounds are unstable and prone to detonation. Herein, we report a general silver‐catalyzed cyclopropenation
Cyclopropyl/phenylcyclopropenyl cations: studies in stabilization
作者:Robert A. Moss、Shilan. Shen、Karsten. Krogh-Jespersen、Joseph A. Potenza、Harvey J. Schugar、Ramesh C. Munjal
DOI:10.1021/ja00261a022
日期:1986.1
Etude des structures cristallines des composes Cy 3 C 3 SbF 6 et Cy 2 PhC 3 BF 4 . Calcul d'orbitale moleculaire rationalisant la stabilite relative de ces cations
Synthesis of Cyclopentadienols by Rhodium-Catalyzed C–H Activation of 8-Formylquinolines and [2+2+1] Carbocyclization with Alkynes
作者:Xingwei Li、Xifa Yang、Zisong Qi
DOI:10.1021/acscatal.6b01936
日期:2016.10.7
An efficient Rh(III)-catalyzed redox-neutral [2+2+1] coupling between 8-formylquinolines and alkynes has been realized for the synthesis of cyclopentadienols with broad substrate scope and functional group tolerance. The reaction occurs via C (acyl)–H activation with double insertion of the alkyne in high atom-economy. Instead of simply undergoing a [2+2+1] cyclization, a subsequent formal intermolecular