Visible-Light-Driven C4-Selective Alkylation of Pyridinium Derivatives with Alkyl Bromides
作者:Sungwoo Jung、Sanghoon Shin、Seongjin Park、Sungwoo Hong
DOI:10.1021/jacs.0c04499
日期:2020.7.1
Reported herein is a general strategy for the photochemical cross-coupling between N-amidopyridinium salts and various alkyl bro-mides under photocatalyst-free conditions, granting facile access to various C4-alkylated pyridines. This approach exploits the intri-guing photochemical activity of electrondonor-acceptor (EDA) complexes between N-amidopyridinium salts and bromide, which provides a photoactive
Ruthenium-Catalyzed Conversion of sp<sup>3</sup> C–O Bonds in Ethers to C–C Bonds Using Triarylboroxines
作者:Yohei Ogiwara、Takuya Kochi、Fumitoshi Kakiuchi
DOI:10.1021/ol2012007
日期:2011.6.17
Catalytic conversion of unreactive sp(3) C-O bonds in alkyl ethers to C-C bonds is described. Alkyl ethers bearing 2- or 4-pyridyl groups were coupled with triarylboroxines in the presence of a ruthenium catalyst. Triarylboroxines bearing a variety of functional groups including electron-withdrawing and -donating groups can be used for the reaction. No additional base was required for the coupling with the organoboron reagents, and base-sensitive groups can be tolerated. The reaction is considered to proceed via dehydroalkoxylation followed by addition of triarylboroxines to form C-C bonds.