Cross-Coupling of Nonactivated Alkyl Halides with Alkynyl Grignard Reagents: A Nickel Pincer Complex as the Catalyst
作者:Oleg Vechorkin、Aurélien Godinat、Rosario Scopelliti、Xile Hu
DOI:10.1002/anie.201105964
日期:2011.12.2
In a pinch: The nickel pincer complex 1 catalyzes the cross‐coupling of the title compounds with remarkable substrate scope and functional group tolerance. A nickel/alkynyl species was isolated and shown to be catalytically competent. THF=tetrahydrofuran, O‐TMEDA=bis[2‐(N,N‐dimethylaminoethyl)] ether.
N-Heterocyclic carbene copper-catalyzed direct alkylation of terminal alkynes with non-activated alkyl triflates
作者:Liqun Jin、Wangfang Hao、Jianeng Xu、Nan Sun、Baoxiang Hu、Zhenlu Shen、Weimin Mo、Xinquan Hu
DOI:10.1039/c7cc00891k
日期:——
(NHC)-Cu-catalyzed C(sp)-C(sp3) bond formation has been successfully achieved under mild conditions. Nonactivated alkyl triflates, which could be easily derived from alcohols, were utilized as C-O electrophiles. Mechanistic studies suggested that...
REACTION OF TRIALKYLBORANE WITH 1-ALKYNE AND LEAD(IV) ACETATE. A NEW REGIOSPECIFIC AND STEREOSPECIFIC ONE-POT SYNTHESIS OF ENOL ACETATES
作者:Yuzuru Masuda、Masayuki Hoshi、Akira Arase
DOI:10.1246/cl.1980.413
日期:1980.4.5
In the reaction of trialkylborane with 1-alkyne and lead(IV) acetate in hexane, one of the alkyl groups of trialkylborane migrated to the terminal carbon atom of the triple bond, giving regiospecifically an internal enol acetate and an internal alkyne as the main reaction products. The former compound had (Z)-configuration.
Synthesis of gem-Difluorinated Cyclopropanes and Cyclopropenes: Trifluoromethyltrimethylsilane as a Difluorocarbene Source
作者:Fei Wang、Tao Luo、Jinbo Hu、Ying Wang、Hema S. Krishnan、Parag V. Jog、Somesh K. Ganesh、G. K. Surya Prakash、George A. Olah
DOI:10.1002/anie.201101691
日期:2011.7.25
Highly versatile: The Ruppert–Prakash reagent (Me3SiCF3) can be an efficient source of difluorocarbene. By varying the nonmetallic initiator that is used (F− at lower temperatures and I− at higher temperatures), a range of structurally diverse alkenes and alkynes can be converted into the corresponding gem‐difluorinated cyclopropanes and cyclopropenes in good yields (see scheme).