Metal-Free C(sp3)–H Allylation via Aryl Carboxyl Radicals Enabled by Donor–Acceptor Complex
摘要:
The first aryl carboxyl radical generation by the donor-acceptor complex with N-acyloxyphthalimides and Hantzsch esters is reported. Regio- and chemoselective C(sp(3))-H bond allylation is enabled by aryl carboxyl radicals with visible light irradiation under mild and metal-free conditions.
Metal-Free C(sp<sup>3</sup>)–H Allylation via Aryl Carboxyl Radicals Enabled by Donor–Acceptor Complex
作者:Yang Li、Jing Zhang、Defang Li、Yiyun Chen
DOI:10.1021/acs.orglett.8b01172
日期:2018.6.1
The first aryl carboxyl radical generation by the donor-acceptor complex with N-acyloxyphthalimides and Hantzsch esters is reported. Regio- and chemoselective C(sp(3))-H bond allylation is enabled by aryl carboxyl radicals with visible light irradiation under mild and metal-free conditions.
Stereoselective synthesis of hydroxy stilbenoids and styrenes by atom-efficient olefination with thiophthalides
作者:Prithiba Mitra、Brateen Shome、Saroj Ranjan De、Anindya Sarkar、Dipakranjan Mal
DOI:10.1039/c2ob06991a
日期:——
The synthesis of stilbenoids and styryl carboxylic acids is accomplished with high E-stereoselectivity by olefination of aldehydes with thiophthalides under basic conditions. The olefination is highly atom-efficient as it only loses elemental sulfur during the reaction. This olefination, in conjunction with retro Kolbe–Schmitt reaction, allows facile synthesis of E-hydroxystilbenoids with minimal employment of protecting groups. This study also discloses two important findings: formation of i) 4-methylsulfanyl isocoumarins and ii) an 2-arylindenone.