Radical alkylations of activated alkyl iodides and bromides were achieved usingvinyltriflates in the presence of hexadimethyltin, whereas those of unactivated C-H bonds usingvinyltriflates proceeded cleanly under tin-free conditions.
Peroxide promoted tunable decarboxylative alkylation of cinnamic acids to form alkenes or ketones under metal-free conditions
作者:Jing Ji、Ping Liu、Peipei Sun
DOI:10.1039/c5cc01762a
日期:——
In the presence of DTBP or DTBP/TBHP, the decarboxylative alkylation of cinnamic acids with alkanes gave alkenes and ketones respectively via a radical mechanism in moderate to good yields.
MnO2-Catalyzed Oxidative Alkylation of Enamides with Ethers via C(sp3)–H/C(sp2)–H Cross-Dehydrogenative Coupling and Hydrolysis Sequence
作者:Xiangsheng Xu、Zhiyan Hu、Yucai Tang、Shan Zhang、Xiaoqing Li、Xiaohua Du
DOI:10.1055/s-0035-1560180
日期:——
A new MnO2-catalyzed oxidative alkylation of enamides with a C(sp3)–H bond adjacent to an oxygen atom is described. This method achieves a C(sp3)-H/C(sp2)-H cross-dehydrogenative coupling and hydrolysis, thus providing efficient and general access to a variety of β-oxo ketones.
Visible-light-promoted oxidative coupling of styrene with cyclic ethers
作者:Golam Kibriya、Debashis Ghosh、Alakananda Hajra
DOI:10.1007/s11426-019-9609-9
日期:2020.1
A new visible-light-promoted oxidative coupling of vinylarenes with cyclic ethers has been developed using rose bengal as photocatalyst and tert-butyl hydrogenperoxide (TBHP) as oxidant under ambient air at room temperature. A library of α-oxyalkylated ketones with broad functionalities has been synthesized in moderate to good yields. A radical mechanism is suggested for the present protocol
Strategic use of oxophilic (hard) gold(III) and π-philic (soft) gold(I) catalysts provides access to two types of cyclic ethers from propargylic alcohols. Thus, heating propargylic alcohols with an oxophilic gold(III) catalyst (AuBr3) results in cyclization to afford cyclic ethers bearing an acetylenic moiety, due to coordination of gold(III) to the oxygen of the propargylic hydroxyl group. On the