Direct Electrophilic C−H Alkynylation of Unprotected 2-Vinylanilines
作者:Lucien D. Caspers、Peter Finkbeiner、Boris J. Nachtsheim
DOI:10.1002/chem.201606026
日期:2017.2.24
Unprotected aromatic amines can be used as directing groups in metal‐catalyzed C−H alkynylations of alkenes. By using low amounts of an IrIII catalyst in combination with alkynylbenziodoxolones as electrophilic alkyne‐transfer reagents, highly desirable 1,3‐enynes were isolated in excellent yields of up to 98 % with Z stereoselectivity. A broad substrate scope as well as the high synthetic utility
NH<sub>2</sub>-Directed C–H Alkenylation of 2-Vinylanilines with Vinylbenziodoxolones
作者:Andreas Boelke、Lucien D. Caspers、Boris J. Nachtsheim
DOI:10.1021/acs.orglett.7b02630
日期:2017.10.6
directing-group-mediated C–H alkenylation with alkenyl-λ3-iodanes as electrophilic alkene-transfer reagents has been developed. The application of free aromatic amines as challenging but synthetically valuable directing groups in combination with an IrIII catalyst enabled the synthesis of highly desirable 1,3-dienes in excellent yields of up to 98% with high to perfect (Z,E) stereoselectivity. A broad substrate
A novel rhodium-catalyzed oxidative [5 + 1] annulation of 2-vinylanilines with α-diazocarbonyl compounds for the construction of quinoline-2-carboxylate derivatives has been developed. A series of functional groups such as methyl, methoxy, fluoro, chloro, bromo, cyano, and even thienyl substituents were tolerated well. This methodology has the potential for use in the pharmaceutical industry.
Divergent synthesis of 2-methylthioindole and 2-unsubstituted indole derivatives mediated by SOCl<sub>2</sub> and dimethyl/diethyl sulfoxides
作者:Jingran Zhang、Beibei Zhang、Jiaxin He、Haofeng Shi、Yunfei Du
DOI:10.1039/d2ob01580c
日期:——
A metal-free divergentsynthesis of indole compounds dependent on a reagent via intramolecular C(sp2)–H amination was described. The reaction of 2-vinylanilines with DMSO/SOCl2 at 70 °C was found to give 2-thiomethylindoles, while replacing DMSO with diethyl sulfoxide afforded 2-unsubstituted indoles in a highly selective manner.